iMac Core Duo Problems?

[Texas04]

Just to clarify, does anyone have this problem and not have an Airport base station but instead a regular router?

 

[wpwj40e]

Just to clarify, does anyone have this problem and not have an Airport base station but instead a regular router?

Do not have an airport base station. as do the 75 or so odd folks on the apple support forum. Although there also seems to be a group that have the base and ALSO have the problem.

Therese

 

[plinden]

Just to clarify, does anyone have this problem and not have an Airport base station but instead a regular router?

If you go back four or five messages, you'll see my issues. I have a netgear router.

 

[Bluured arms]

IPv6 fix

I had the wireless problem from day one. I got fed up and hooked a cable up to my linksys router and still had very erratic download speeds and upon waking my IP address would be reset. I tried everything in the Apple Discussion threads and nothing worked...until I disabled IPv6. As soon as this was gone, I was blazing through the speakeasy test and was able to watch QT movie trailers without them pausing all of the time.

Also, I bought an AEBS and everything is so much smoother, but I noticed that it requests to keep IPv6 on to "communicate better". I called my cable company and they said don't use it under any circumstance since its not supported.

Don't know if this will help!

Ron

 

[MRU]

I had the wireless problem from day one. I got fed up and hooked a cable up to my linksys router and still had very erratic download speeds and upon waking my IP address would be reset. I tried everything in the Apple Discussion threads and nothing worked...until I disabled IPv6. As soon as this was gone, I was blazing through the speakeasy test and was able to watch QT movie trailers without them pausing all of the time.

Also, I bought an AEBS and everything is so much smoother, but I noticed that it requests to keep IPv6 on to "communicate better". I called my cable company and they said don't use it under any circumstance since its not supported.

Don't know if this will help!

Ron

Disabled mine.. But no difference hold on though...

SpeakEasy gives me 950/192 which is a boost from the 600/80 I was getting average before...

But I just enabled Interference Robustness on the airport dropdown (I have a BT mouse & Keyboard) and speed has boosted to a respectable 1580/241 close to what I was getting via ethernet...


So Disable IPv6 and Enable Interferance Robustness has help me. Time will tell if its a permanent solution or if speed will fluctuate..

 

[MRU]

Damnit Janet!!!

It does fluctuate.. Ran speed test a couple more times...

Download Speed: 876 kbps (109.5 KB/sec transfer rate)
Upload Speed: 228 kbps (28.5 KB/sec transfer rate)

Download Speed: 823 kbps (102.9 KB/sec transfer rate)
Upload Speed: 228 kbps (28.5 KB/sec transfer rate)

Download Speed: 974 kbps (121.8 KB/sec transfer rate)
Upload Speed: 228 kbps (28.5 KB/sec transfer rate)

Download Speed: 619 kbps (77.4 KB/sec transfer rate)
Upload Speed: 232 kbps (29 KB/sec transfer rate)



All results with the Airport IPv6 disabled and Interference Robustness on.

Speed still about 40-50% of what it should be and it's fluctuating pattern must be indicative of somthing...

Back to my stopgap solution again

 

[munkees]

i don't understand, I have no problems at all, but yet I worried I should have I get the same through put as any other computer I have here. I am using an Airport base station, one difference is I have to use the version 5.5.1 for my basestation or the PPPoE will not work with my provider.

my iMac network is configured with the IP6 setting to automatic.

my airport is configures with 128 wep, then I also have the Mac addresses list for only allowed computers

 

[applekid]

If you go back four or five messages, you'll see my issues. I have a netgear router.

As I do, too.

And 10.4.5 hasn't made any improvements. Last night I could make no connection.

The only ways the problems seems to solve itself, is if you stay disconnected for a while and try again or restarting and trying again.

 

[munkees]

Those having trouble try this

"his is a follow-up on the same problem of slow download speeds.

Yesterday a tech specialist from Apple got back to me about the problem after I called them.

The engineering departments says that there is inteference between channel 6 on wireless routers with Bluetooth. They told me to change to any other channel and the problem should be solved. I just changed my D-Link 624 to channel 11 returned to our wireless keyboard and wireless mouse and we now have screaming fast download speeds that match our 15 inch PB.

Hope this info helps others solve this problem."

found this on a forum at the apple support, might help you guys out

 

[tivoboy]

interesting

I am on channel 11 already, and continue to have this problem. so, maybe no pancea, but seems like it might work for some.

 

[Zaty]

My 17" iMac Core Duo also has problems with the WiFi connection. I only get about the half the speed compared to my 12" Rev. B PowerBook.

 

[Passante]

WiFi problems with intel Macs?

snip

3. My AirPort Extreme Card has been acting funny. My router and my iMac G4 is running without a problem for internet connections. But sometimes, my iMac Core Duo cannot find my router. I have Interference Robustness on. Maybe that's the problem. This problem has occurred a couple of times over the last day and it's after I had that option on.

I saw the new Macpro books at the Apple store this weekend. Both laptops had WIRED ethernet connections. They were not using WIFI. Didn't notice how the iMacs were connected since everything is in the back.

Here is hoping for an Intel mini on Tuesday.

 

[MRU]

I saw the new Macpro books at the Apple store this weekend. Both laptops had WIRED ethernet connections. They were not using WIFI. Didn't notice how the iMacs were connected since everything is in the back.

Here is hoping for an Intel mini on Tuesday.

And why not we wonder? There is a big open case on the Airport issues and it is catagorised by Apple as somthing that has to be sorted before the next update release (so it is looking like a software problem (phew) and not hardware)..

Apple support discussions have a lot of posters with the same problem and it's good to see apple acknowledge it.

Surprised mac book pro owners haven't reported anything back yet, but I guess unless you have a comparison at hand you probably wouldnt realise there was a problem...

 

[mr.know.it.all]

The issue is only effecting the new Intel iMac's both 17" & 20". It's not the same Airport card used in all other mac's it's a new one and hence the problems. Its also the same as the one that will be used in the new macbookpro and hence it to will probably suffer the same problems with wireless. In fact it may suffer worse as it's a mobile device and hence it's location to a basestation changes more so than a desktop...

It's seems pretty much universal problem with the intel imacs and I'm sure it's a juvenile driver that's the cause. 10.4.5 for intel or a specific airport update will no doubt find it's way to us. It's just a case of make do with it at the moment.

This is the case in the Dual-Core G5's as well.

The combo Airport/Bluetooth card it ships with is really weak for some reason. It should (I assume) be the same card as mention in this thread. I have a DC 2.3ghz with the combo card, and it can't maintain a link with the wireless access point that all four of other computers in the home can hit. Even an older iBook laptop next to my G5 can hit it with no problems. The G5 can see the wireless access point sometimes, but always gives the same error message when I try to join.

I hope the next revision of the OS will fix it. But I have a feeling it's a hardware issue in the card itself. It may just be a case of the "transitions".

 

[Zaty]

And why not we wonder? There is a big open case on the Airport issues and it is catagorised by Apple as somthing that has to be sorted before the next update release (so it is looking like a software problem (phew) and not hardware)..

Apple support discussions have a lot of posters with the same problem and it's good to see apple acknowledge it.

Surprised mac book pro owners haven't reported anything back yet, but I guess unless you have a comparison at hand you probably wouldnt realise there was a problem...

Hopefully you're right and Apple is working on it. According to a poster on the Apple Discussions, Apple apparently still denies knowing about the existence of that problem.

 

[powerbook911]

I have not had any airport problems with my iMac. Been using airport, since day one (more than 4 weeks ago), and it has worked fine. A shame that some are having problems, but hopefully it will be sorted out.

 

[munkees]

I think the big differences are that, in the old days, hard drives were not as fast, and programs were not as large, and so people tried to avoid using VM altogether for performance reasons. It's still true that VM drags your system down. The difference is that now, everything is built around a model of using it. Also, as far as OS X is concerned, it comes from a Unix heritage, and Unix has used this model for a long time.

Don't blame vm on unix, blame it on GUI's

 

[beachboy89]

I have the imac 20 inch core duo 2.0 and Ive experienced no problems with it. I have a second desplay hooked up and when I wake up the computer, it does it just fine so maybe its just an isolated issue

 

[Zaty]

The solution (for slow WiFi connections)

Apparently, the chipset seems to have problems with (certain?) 802.11g routers. Switching your network to 802.11b solves the problem! Further information can be found here:

http://discussions.apple.com/thread.jspa?messageID=1822533#1822533

 

[plinden]

Apparently, the chipset seems to have problems with (certain?) 802.11g routers. Switching your network to 802.11b solves the problem! Further information can be found here:

http://discussions.apple.com/thread.jspa?messageID=1822533#1822533

No, makes no difference to my wireless download speeds - still at 1/3 - 1/4 of wired when using WPA encryption. I guess I could go to WEP encryption with SSID broadcast off and MAC address filtering.

And why not we wonder? There is a big open case on the Airport issues and it is catagorised by Apple as somthing that has to be sorted before the next update release (so it is looking like a software problem (phew) and not hardware)..

Apple support discussions have a lot of posters with the same problem and it's good to see apple acknowledge it.

Do you have a link for this? I would like to follow this to get the solution if or when it's ready.

 

[Zaty]

I'm sorry, it didn't work for you. I use WEP and SSID broadcast. With these settings (and 802.11b only) my iMac works great over wireless, as matter of fact, it's even faster than my PowerBook.

Given that certain "tricks" solve the issue for some people but not for everyone, raises the question if perhaps there is more than one issue causing those problems.

 

[kntgsp]

Yea, I don't seem to have any wireless problems with mine as of yet. I've mostly just had the problem with media keys not working intermittently.

 

[designed]

Mine has an interesting problem (just arrived this morning): the display went corrupt (horizontal and vertical lines, flickering, ghost images like it was a burnt through CRT) after first time the system switched it off (screen saver). I rebooted and switched it off completely, even took the power cord off for a while. Nothing helped.

So I called Apple and they declared the system was DOA so it would be replaced ASAP with the new system getting delivered to my house "either today or tomorrow". Might be until next week though. Anyway, while I was on the phone, the display apparently started mending itself and now it looks ok. The "good" thing is that every time it gets awaken from screen saver (not usually when it gets awaken from sleep mode) the screen flickers really badly for a long time.

Shame, I didn't seem to have any problem with wireless, no dead pixels, working keyboard and mouse and even the disc drive was aligned properly. Hopefully the replacement unit will be even better.

 

[WinterMute]

Apparently, the chipset seems to have problems with (certain?) 802.11g routers. Switching your network to 802.11b solves the problem! Further information can be found here:

http://discussions.apple.com/thread.jspa?messageID=1822533#1822533

My 20" iMac turned up yesterday and immediately started exhibiting the problems described in the thread above.

Switching to b from b/g sorted almost everything except a reluctance top pick up the basestation on startup or from sleep.

Once it's acquired the station it's rock solid, and has improved reception (1/2 bars on g all 4 on b).

Might try switching IPv6 off today, although I do believe in "if it ain't broke, don't fix it".

It's an excellent machine otherwise (what a screen) and I'm sure Apple will fix the problem (even if they don't acknowledge it...)

 

[designed]

Got a call few hours ago from the Mac servicing company that my iMac was sent to on Friday. The fault in my iMac (described two posts above) turned out to be a faulty display adapter.

It was a clear problem (judging from the nature of the call) and the mac is apparently going back to Apple for re-furbisihing and I'm supposed to get a call from the company that I bought it from in the first place and get a new one.