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Yep. Possible.

However I wonder what you mean by sluggish - If it's a GPU issue (in case your not on a Mac Pro/XServe) you will experience the same sluggish-ness.
There is only a fix available for the ATI X1600 GPU. Else you'll have to use MLPF to get proper graphics.

Thats good to know, I'll move back to 10.8.5 to see how it works!

I'm using Mac Pro 2,1, GTX 460 graphics and SSD's. It's not that OS is slow, it's just sluggish when opening preview, file/save dialogs etc. If you search the net you'll notice a lot of people complain about it as well.

Thanks for the info, much appreciated!

----------

Yes it is, I tried it...works fine.

Theres a few reasons why you can be experiencing the sluggishness (that is if you have a mac pro and the required graphics card)

I noticed that Mavericks Indexes quite a a lot in the first few days which causes a bit of sluggishness... Give it a few days and it should behave like normal...Also take into consideration if you have Time machine set up an if its rewriting large backups and also keep in mind mac os x defragmenting in the background... Mac OS X auto defragments since 10.4.. After a few days things should be crisp and smooth again..

Some issues that I notice, but from what I hear others with newer Macs have the same issues with Mavericks, is a longer boot time then usual. I also notice that when downloading large files things become sluggish too which i never experienced before and I'm on a clean install on a newish drive..

Upgrading to an SSD would solve a lot too but, I do think a lot of it has to do with Mavericks not being perfect yet... We are still only on 10.9.1. and well see what bugs get ironed out with the next update.

Check the app store and read the recent reviews for Mavericks. A lot of people with 2012 and 2013 new machines are experiencing issues as well with poor performance.. My buddy just bought the new retina macbook pro and we did a side by side test opening apps... Mine (Hacked Mac Pro 2,1) opened up Logic Pro faster, opened up iPhoto the same time, and his won on opening up iTunes.. Also His boot time was only 12 secs thanks to the SSD.Mine was 30 secs. But he still has weird graphic issues with apps, which i notice on a lot of machines, so i think its more an OS thing.. the 10.9.2 update is focusing on graphic drivers..

To everyone using this hack on a Mac Pro, whats your boot time with mavericks?

Mine is 30-35 secs on a 7200 data.

I have SSD's, GTX 460 so I don't think hardware is the issue. I'm talking about sluggish file/save dialogs, preview opening dead slow etc. A lot of people actually complain about it... don't let me started on the "multi monitor" features that are slowing down everything.

My boot time is about 10 seconds, I'm not dissatisfied with overall speed of the OS, but the multi display issues, dialog slowness is simply a bummer.
 
Thats good to know, I'll move back to 10.8.5 to see how it works!

I'm using Mac Pro 2,1, GTX 460 graphics and SSD's. It's not that OS is slow, it's just sluggish when opening preview, file/save dialogs etc. If you search the net you'll notice a lot of people complain about it as well.

Thanks for the info, much appreciated!


I experience the same thing after 10.9.1... 10.9 seemed a lot more stable :)
Im gonna upgrade to SSD's...i envy your boot time!!! :)
 
Experiences with GeForce 8800 GT?

I'm interested in anyone's experiences with the NVIDIA GeForce 8800 GT 512 MB under Mavericks on a 1,1 or 2,1 Mac Pro.

At least one post in this thread said it was pretty bad. I'm curious why that should be, since Apple lists it as being compatible with OpenCL under Mavericks and good enough for FCP X, Motion 5, and Compressor 4 -- along with some lesser cards and the Radeon HD 5770, which many people have reported success with.

The other thing that makes me think the 8800 GT should be OK is that mine seemed to work fine under Mavericks in my Nehalem when I tried it in there out of curiosity.

I'm starting to wonder if maybe there were different versions of that card, since I've read reports that the one Apple released as an upgrade kit for the 1,1 isn't supposed to work at all in the Nehalem (something about 32 vs. 64 bit firmware or something), but mine works in both machines. (Have only tried up to Lion on the 1,1, though.)

(I know ... I could just try it and find out! But spare time is very scare at the moment so I was hoping to get a sense of whether it would be worth the trouble to do the tiamo install with this card. I'm not going to use it for any heavy lifting, but it would be nice to be able to play videos and scroll web pages without flashing and artifacts :) )
 
Anybody using it without issues?

I have no problems with FileVault2 on my MP1,1 running Mavericks, well the only difference is you don't get the nice login screen.
Instead you get a text based screen, however everything works fine including using a Bluetooth keyboard to login.
 
Worth spending £500 to upgrade a 1,1?

I have a Mac Pro 1,1 with 2x 2.66GHz dual-core Woodcrests, 4x 1Gb memory, 120Gb SSD (SATA), 2x 3Tb hard disks, 7300GT, and Apple Bluetooth+wifi card. Have just installed 10.9 thanks to Tiamo's method. As the 7300GT isn't supported I'm also using a PC's 8600GT (which works fine aside from missing bootscreens).

I'm considering upgrading it with a 7950, 2x X5365 (i.e. 3.0GHz octo-core), and another 4 Gb memory. Total cost of this would be around £500 ($800); this amount doesn't buy a decent secondhand later generation Mac Pro from eBay. If I felt Tiamo's solution offers another 3 years' life I'd be less hesitant.

Do people think this is too much to spend on an aging machine?
 
I am going to say yes, $800 is to much for this old of a Mac, we have no way of knowing what chalenges future updates will bring. This fix is a good way prolong the life and investment of your Mac but I would save that money for a newer machine in the future. My 2 cents
 
I'm interested in anyone's experiences with the NVIDIA GeForce 8800 GT 512 MB under Mavericks on a 1,1 or 2,1 Mac Pro.

At least one post in this thread said it was pretty bad. I'm curious why that should be, since Apple lists it as being compatible with OpenCL under Mavericks and good enough for FCP X, Motion 5, and Compressor 4 -- along with some lesser cards and the Radeon HD 5770, which many people have reported success with.

The other thing that makes me think the 8800 GT should be OK is that mine seemed to work fine under Mavericks in my Nehalem when I tried it in there out of curiosity.

I'm starting to wonder if maybe there were different versions of that card, since I've read reports that the one Apple released as an upgrade kit for the 1,1 isn't supposed to work at all in the Nehalem (something about 32 vs. 64 bit firmware or something), but mine works in both machines. (Have only tried up to Lion on the 1,1, though.)

(I know ... I could just try it and find out! But spare time is very scare at the moment so I was hoping to get a sense of whether it would be worth the trouble to do the tiamo install with this card. I'm not going to use it for any heavy lifting, but it would be nice to be able to play videos and scroll web pages without flashing and artifacts :) )

It works just great, I often use it in my Mac Pro. Mavericks detects it, I have non-EFI PC version of EVGA 8800GT (thin version, but all versions should work)

----------

I have a Mac Pro 1,1 with 2x 2.66GHz dual-core Woodcrests, 4x 1Gb memory, 120Gb SSD (SATA), 2x 3Tb hard disks, 7300GT, and Apple Bluetooth+wifi card. Have just installed 10.9 thanks to Tiamo's method. As the 7300GT isn't supported I'm also using a PC's 8600GT (which works fine aside from missing bootscreens).

I'm considering upgrading it with a 7950, 2x X5365 (i.e. 3.0GHz octo-core), and another 4 Gb memory. Total cost of this would be around £500 ($800); this amount doesn't buy a decent secondhand later generation Mac Pro from eBay. If I felt Tiamo's solution offers another 3 years' life I'd be less hesitant.

Do people think this is too much to spend on an aging machine?

It's just too much to buy new gear. But X5365 is a bit overkill and only 20-30% better than X5355 (SLAEG ver). You can find 2x x5355 SLAEG CPU's on ebay for under 100$. I also found DDR2 667 ECC Fully Buffered RAM, 8GB of used for around 40-50$ on ebay. Both CPU and RAM is used, but it's tested and there is no reason why you should give it a try.
 
Thank you both, points taken. I basically agree with you, but struggle to accept the consequences.

a) Yes, £500 / USD 800 is a lot, but it's nowhere near enough to cover even a refurbished decent iMac, let alone Pro. How else could at least comparable perfornance be obtained from a different unit without spending over twice that? The resale value of a 1,1 is poor.

b) I accept there's an unnecessary premium for the X5365. With regards to the FBDIMMs though I've read reports of overheating given the smaller heatsinks on server-pulls. Have yours been OK?
 
Thank you both, points taken. I basically agree with you, but struggle to accept the consequences.

a) Yes, £500 / USD 800 is a lot, but it's nowhere near enough to cover even a refurbished decent iMac, let alone Pro. How else could at least comparable perfornance be obtained from a different unit without spending over twice that? The resale value of a 1,1 is poor.

b) I accept there's an unnecessary premium for the X5365. With regards to the FBDIMMs though I've read reports of overheating given the smaller heatsinks on server-pulls. Have yours been OK?

I have upgraded my MacPro 1,1 to 5365's and have had no problems, I got mine for around £120 as they seemed to be expensive. My genuine 5770 graphics card was £200 new from Apple, I paid around £80 for another 8GB of memory. Thats a total of £400 but I know the Xeons are cheaper now as is the memory. I understand that re-flashed PC based 5770's can be had for a lot cheaper. I wanted zero hassle so paid the money out, winced once but never thought about it again.

I used the heatsinks that came with the memory. The memory gets very, very hot but I have had zero problems with them running at 70C, which astounds me :) I had forgotten they run so hot to be honest, but really fretted about it when I first had them.

I have looked at newer kit but to be honest, my 2006 Mac Pro still works well, I do have an 2012 iMac and a 2013 Macbook Pro so my time splits 60% Macbook Pro for work, 30% Mac Pro for home dev use and Final Cut Pro X and 10% on the iMac as its downstairs. I can't justify even a newer (but older if you see what I mean) MacPro as this one just keeps going on and on and on.... Its the oldest computer in the house and still provides sterling service as a video editor, an Xcode development machine, iTunes server, VMWare client etc etc etc.

Rob.
 
Thank you both, points taken. I basically agree with you, but struggle to accept the consequences.

a) Yes, £500 / USD 800 is a lot, but it's nowhere near enough to cover even a refurbished decent iMac, let alone Pro. How else could at least comparable perfornance be obtained from a different unit without spending over twice that? The resale value of a 1,1 is poor.

b) I accept there's an unnecessary premium for the X5365. With regards to the FBDIMMs though I've read reports of overheating given the smaller heatsinks on server-pulls. Have yours been OK?

Don't struggle, order : )

http://www.ebay.com/itm/8GB-4x2GB-6...8904305?pt=US_Memory_RAM_&hash=item338709e371

Search Ebay for intel xeon slaeg x5355 so I don't copy paste huge ebay links here ! : )

DDR2 ECC and Fully Buffered will always be higher temp, my stock RAM is about 70 C so it's ok... Besides, you can always install SMCFanControl and control fans yourself (as I do).

Cheers
 
Experiences with GeForce 8800 GT?

It works just great, I often use it in my Mac Pro. Mavericks detects it, I have non-EFI PC version of EVGA 8800GT (thin version, but all versions should work)

Thanks for that info. Just to clarify, which Mac Pro is that running on? As mentioned, my 8800GT works fine with Mavericks in my 2009 Pro, but one post here said it performed very poorly on a 2006 Pro with the Tiamo hack. I don't know why there should be a difference, though.
 
wrt Recovery HD, installers, et al.

This'll probably be nowhere near complete (or satisfying), but it seemed best to share.

A myriad of ways to build an installer incorporating tiamo's mod exist (and are related); most, if not all to success.

I have the legacy of the jabbawok strategy from when I was utilizing teh Chameleon thing, which includes a dedicated installer partition set-aside for easy modification, and speed.

This'll probably be nowhere near complete (or satisfying to all parties), but it seemed best to share.

This is not yet a step-by-step....

A myriad of ways to build an installer incorporating tiamo's mod exist (and are related); most, if not all, to success.

I hold the legacy of the jabbawok strategy from when I was utilizing teh Chameleon thing (I jumped from Lion directly to Mavericks), which includes a dedicated installer partition set-aside for easy modification, and speed.

Success, and satisfaction ensues with the replacement of the tiamo-sourced boot.efi (an appreciation for which none can truly formally fulfill (I've read the source, compiled it, modified it, and I still don't really understand exactly wth 'it' is)).

One thing that stymied my (and others') efforts along the way was the need for the Recovery HD partition. Many solutions are out there. Props to Dalton63841 for his eloquence, rhysforrester for his preciseness, and Bruno09 for the subtle details that enabled my success.

So, it's so: we can create the Recovery HD at-will, without a doubt.

But, we still get a partition with "BaseSystem.dmg" as Teh Core . . .

. . . a BaseSystem that is as from Apple Source, and will not boot on a tiamo-modified System.

So, I tried, and tried to get Cmd+R to work on boot to no avail.

[createinstallmedia was a dead-end, AFAIC, wrt the preservation of the tiamo-mod]

"How do I get to a Recovery diskutil from a InstallESD.dmg Source on a tiamo-sourced system?"

Not possible via teh Dalton scripts, considering that a mod of the InstallESD Source fails validation on usage (I've repeatedly sparseimaged and re-packaged and imaged the IESD source dmg many different ways to no avail).

In my efforts, I was able to successfully mod the BaseSystem.dmg to include the tiamo-mods, and use that to image a new Recovery HD partition so as to enable a successful Cmd+R boot.

A semi-complicated combination of hdiutil and Dalton's Recovery steps enabled me to get a modified BaseSystem.dmg onto the Recovery HD to bootable success.

I can't form this into a 1., 2., 3. thing atm, but I can verify that it is possible.

If I can (as I will) repeat my Steps, I will share them, forthcoming...

Regards...
 
Thank you both, points taken. I basically agree with you, but struggle to accept the consequences.

a) Yes, £500 / USD 800 is a lot, but it's nowhere near enough to cover even a refurbished decent iMac, let alone Pro. How else could at least comparable perfornance be obtained from a different unit without spending over twice that? The resale value of a 1,1 is poor.

Keep looking. About 6 months ago, I got a nice Mac Pro 4,1 for 750€ on the bay. I flashed the firmware to 5,1, stuffed a 6 cores Core i7 980 and upped the memory to 24 GB. I sold my Mac Pro 1,1 for a decent amount of money but it had been upgraded to 2 quad Xeon running at 3 GHz.

----------

Could someone clarify what to expect with unsupported graphic cards: unaccelerated display or no boot at all?

I am asking because I installed Mavericks on a FW drive from a supported system, changed the boot files and attempted to boot my MacBook 3,1 from it. I was expecting slow, unaccelerated graphics but the MacBook failed to boot (big no sign on boot screen).

Should I try using the old beta 64 bit drivers that can be found on the web? I am just trying to figure out how unbearably slow the system would be on my MacBook: I only use it for accessing the web, reading mail and the occasional light work in Pages. I'd like to go to Mavericks just to be able to use the new iWork for better interoperability with my other Macs and iOS machines.
 
Thanks for that info. Just to clarify, which Mac Pro is that running on? As mentioned, my 8800GT works fine with Mavericks in my 2009 Pro, but one post here said it performed very poorly on a 2006 Pro with the Tiamo hack. I don't know why there should be a difference, though.

I'm referring to MacPro1,1 converted to MacPro2,1 via firmware upgrade. So you're good!

----------

Keep looking. About 6 months ago, I got a nice Mac Pro 4,1 for 750€ on the bay. I flashed the firmware to 5,1, stuffed a 6 cores Core i7 980 and upped the memory to 24 GB. I sold my Mac Pro 1,1 for a decent amount of money but it had been upgraded to 2 quad Xeon running at 3 GHz.

----------

Could someone clarify what to expect with unsupported graphic cards: unaccelerated display or no boot at all?

I am asking because I installed Mavericks on a FW drive from a supported system, changed the boot files and attempted to boot my MacBook 3,1 from it. I was expecting slow, unaccelerated graphics but the MacBook failed to boot (big no sign on boot screen).

Should I try using the old beta 64 bit drivers that can be found on the web? I am just trying to figure out how unbearably slow the system would be on my MacBook: I only use it for accessing the web, reading mail and the occasional light work in Pages. I'd like to go to Mavericks just to be able to use the new iWork for better interoperability with my other Macs and iOS machines.

In addition to "keep looking", I can't agree more. I got my Mac Pro 1,1 for 150EUR so for 800$ you will manage to find at least MacPro3,1.

As for Mavericks on Macbook3,1 I would simply forget it since Mavericks doesn't seem to support it's graphics card and focus on 10.8.

https://forums.macrumors.com/threads/1550560/ or simply create installer from the guide on this thread 10.9 and use Tiamo's boot.efi for 10.8 since it's confirmed to work!

If you still want to Mavericks, follow this thread but i don't think it will work https://forums.macrumors.com/threads/1593194/
 
This'll probably be nowhere near complete (or satisfying), but it seemed best to share.

A myriad of ways to build an installer incorporating tiamo's mod exist (and are related); most, if not all to success.

I have the legacy of the jabbawok strategy from when I was utilizing teh Chameleon thing, which includes a dedicated installer partition set-aside for easy modification, and speed.

This'll probably be nowhere near complete (or satisfying to all parties), but it seemed best to share.

This is not yet a step-by-step....

A myriad of ways to build an installer incorporating tiamo's mod exist (and are related); most, if not all, to success.

I hold the legacy of the jabbawok strategy from when I was utilizing teh Chameleon thing (I jumped from Lion directly to Mavericks), which includes a dedicated installer partition set-aside for easy modification, and speed.

Success, and satisfaction ensues with the replacement of the tiamo-sourced boot.efi (an appreciation for which none can truly formally fulfill (I've read the source, compiled it, modified it, and I still don't really understand exactly wth 'it' is)).

One thing that stymied my (and others') efforts along the way was the need for the Recovery HD partition. Many solutions are out there. Props to Dalton63841 for his eloquence, rhysforrester for his preciseness, and Bruno09 for the subtle details that enabled my success.

So, it's so: we can create the Recovery HD at-will, without a doubt.

But, we still get a partition with "BaseSystem.dmg" as Teh Core . . .

. . . a BaseSystem that is as from Apple Source, and will not boot on a tiamo-modified System.

So, I tried, and tried to get Cmd+R to work on boot to no avail.

[createinstallmedia was a dead-end, AFAIC, wrt the preservation of the tiamo-mod]

"How do I get to a Recovery diskutil from a InstallESD.dmg Source on a tiamo-sourced system?"

Not possible via teh Dalton scripts, considering that a mod of the InstallESD Source fails validation on usage (I've repeatedly sparseimaged and re-packaged and imaged the IESD source dmg many different ways to no avail).

In my efforts, I was able to successfully mod the BaseSystem.dmg to include the tiamo-mods, and use that to image a new Recovery HD partition so as to enable a successful Cmd+R boot.

A semi-complicated combination of hdiutil and Dalton's Recovery steps enabled me to get a modified BaseSystem.dmg onto the Recovery HD to bootable success.

I can't form this into a 1., 2., 3. thing atm, but I can verify that it is possible.

If I can (as I will) repeat my Steps, I will share them, forthcoming...

Regards...

Daltons recover thingy works for me. The partition is created but I cannot boot from it. I think I know how to fix that though and I'm sure it's down to the platform support plists and other such bits located on the volume.
I need a latest 10.8.5 to try it out though.
 
Daltons recover thingy works for me. The partition is created but I cannot boot from it. I think I know how to fix that though and I'm sure it's down to the platform support plists and other such bits located on the volume.
I need a latest 10.8.5 to try it out though.

Dalton's app is fantastic (it has helped me fix innumerable probs with multiple installs (and I have (at this point in time (not including multiple copies and .dmgs of the same)) about seven).

It was the un-bootable state that was, well, a show-stopper.

The automated app requires an InstallESD.dmg to function, and I have found absolutely no way to circumvent the digital signature via repackaging: we just can't sign with APL's signature.

Thankfully, CRC validation seems to not be part of the process when //Recovery HD/com.apple.recovery.boot/com.apple.Boot.plist Kernel Flags "rp=file:///com.apple.recovery.boot/BaseSystem.dmg".

All one has to re-package the BaseSystem.dmg to include all the usual suspects.

I have new ssd with a fresh install of 10.9.1 (prep for 10.9.2, when the supposed replacement of teh boot.efi(s) comes into play), but one that has no Recovery HD . . . I need to make one, so I will document, and relate, time affording.

I will include urls to Dalton's console commands (the precursors to the automates app process) which are critical to performing the creation process, and the additional hdiutil majik that allows one to open, instantiate, modify, and re-package such a .dmg

Regards, splifingate
 
I have no problems with FileVault2 on my MP1,1 running Mavericks, well the only difference is you don't get the nice login screen.
Instead you get a text based screen, however everything works fine including using a Bluetooth keyboard to login.

I wonder if you use the old WiFi/BT module for the MacPro1,1. I am still not able to have the WiFi and BT working. If I use the old IO80211Family.kext from my 10.6.8 installation, WiFi is working but only for WEB and non-encrypted networks. Besides, BT still not recognized.

Any help would be very appreciated!

regards,
eyseman
 
Dalton's app is fantastic (it has helped me fix innumerable probs with multiple installs (and I have (at this point in time (not including multiple copies and .dmgs of the same)) about seven).

It was the un-bootable state that was, well, a show-stopper.

The automated app requires an InstallESD.dmg to function, and I have found absolutely no way to circumvent the digital signature via repackaging: we just can't sign with APL's signature.

Thankfully, CRC validation seems to not be part of the process when //Recovery HD/com.apple.recovery.boot/com.apple.Boot.plist Kernel Flags "rp=file:///com.apple.recovery.boot/BaseSystem.dmg".

All one has to re-package the BaseSystem.dmg to include all the usual suspects.

I have new ssd with a fresh install of 10.9.1 (prep for 10.9.2, when the supposed replacement of teh boot.efi(s) comes into play), but one that has no Recovery HD . . . I need to make one, so I will document, and relate, time affording.

I will include urls to Dalton's console commands (the precursors to the automates app process) which are critical to performing the creation process, and the additional hdiutil majik that allows one to open, instantiate, modify, and re-package such a .dmg

Regards, splifingate

Absolutely right. Have altered all of the boot.efi files and the platform support plists and the recovery now boots.
 
I have no problems with FileVault2 on my MP1,1 running Mavericks, well the only difference is you don't get the nice login screen.
Instead you get a text based screen, however everything works fine including using a Bluetooth keyboard to login.
Once I have a 100% system I'll give Filevault a shot. Just iMessage is my issue now.
 
I wonder if you use the old WiFi/BT module for the MacPro1,1. I am still not able to have the WiFi and BT working. If I use the old IO80211Family.kext from my 10.6.8 installation, WiFi is working but only for WEB and non-encrypted networks. Besides, BT still not recognized.

Any help would be very appreciated!

regards,
eyseman

Interesting to know, so you can confirm that bluetooth and wifi cards for Mac Pro (builtin ones) do not work on Mavericks?
 
I wonder if you use the old WiFi/BT module for the MacPro1,1. I am still not able to have the WiFi and BT working. If I use the old IO80211Family.kext from my 10.6.8 installation, WiFi is working but only for WEB and non-encrypted networks. Besides, BT still not recognized.

Interesting to know, so you can confirm that bluetooth and wifi cards for Mac Pro (builtin ones) do not work on Mavericks?

On my Mac Pro 1,1 with the Apple WiFi and Bluetooth cards that came with the machine, it all works perfectly under Mavericks. I have no problems with Bluetooth or connecting to WiFi networks (both 2.4 and 5GHz) with WPA2.

I just did a standard clean install (the drives had nothing on them) of Mavericks with the slightly modified usb installer (swapped boot.efi and modified supported machines) as per tiamo's original instructions.

After the clean install I didn't need to do anything for it all to work, the only issue I've had was after installing Mavericks a third time on the same day (I was testing different Fusion Drive configurations) iMessages didn't want to connect (it worked fine on the previous installs), so I removed the account, restarted the computer, then re-added the account and it worked fine.

EDIT: Added screenshots of my WiFi and Bluetooth details. The only major part of my Mac Pro which has been swapped is the graphics card, I'm currently using a flashed XFX ATI 4870 1GB, apart from that the only other bits which have been changed are RAM and the HDD's/SSD.
 

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On my Mac Pro 1,1 with the Apple WiFi and Bluetooth cards that came with the machine, it all works perfectly under Mavericks. I have no problems with Bluetooth or connecting to WiFi networks (both 2.4 and 5GHz) with WPA2.

I just did a standard clean install (the drives had nothing on them) of Mavericks with the slightly modified usb installer (swapped boot.efi and modified supported machines) as per tiamo's original instructions.

After the clean install I didn't need to do anything for it all to work, the only issue I've had was after installing Mavericks a third time on the same day (I was testing different Fusion Drive configurations) iMessages didn't want to connect (it worked fine on the previous installs), so I removed the account, restarted the computer, then re-added the account and it worked fine.

EDIT: Added screenshots of my WiFi and Bluetooth details. The only major part of my Mac Pro which has been swapped is the graphics card, I'm currently using a flashed XFX ATI 4870 1GB, apart from that the only other bits which have been changed are RAM and the HDD's/SSD.

hi,

thanks for the quick answer. It seems that you have a newer airport extreme than I have. Mine does not support the N-draft and has an Atheros chipset and not a Broadcom one. Therefore, I would conclude that my problem is chipset related.

Besides: to contribute to the graphics card situation:

I can confirm that it works with a AMD Radeon HD7750 1GB DDR5. Also I have no issues with the HDMI port.

cheers,
eyseman
 
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