I bought an MP 5,1 a couple of years ago that was upgraded to Catalina and there was no issues with it ever. I wanted to sell and maybe stupidly decided to erase the SSD to wipe the computer and re-install Catalina for the new owner. In doing so after the Catalina re install finished when the computer restarted and just shut off immediately. Every time I turn on the computer it shuts down after 30 seconds. If I hold the option on key on boot, the tower will stay on but I still can't seem to get the display working. Sorry I am not overly educated in this world. I purchased this computer already configured for Catalina. If someone can please help me I would be forever grateful!
Got a tip for us?
Let us know
Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
MP 1,1-5,1 MP 5,1 won't boot after wiping SSD for selling purposes.
- Thread starter AHDW135
- Start date
- Sort by reaction score
You would need a patched install to reinstall Catalina, as that is not a native-supported version.
The patcher from dosdude1 would work great, and should get you going with a good system.
Or, go back a step or two with an older macOS version, so you won't need to do a patched system install.
Mojave (macOS 10.14) would be a good choice, I think.
The patcher from dosdude1 would work great, and should get you going with a good system.
Or, go back a step or two with an older macOS version, so you won't need to do a patched system install.
Mojave (macOS 10.14) would be a good choice, I think.
12 Core 3.33Ghz Xeon, 64GB ram, 1TB SSD for OS/Apps and 10TB storage across 4 drives. Radeon RX480 (metal compatible) with a titanRidge card offering thunderbolt3. Sorry if that isn't very detailed.
I have thought about doing this but I can't get the display to work upon booting so I don't know how to make it work. If I had that patch install loaded on a usb would It automatically start upon boot or would I need to be able to see the display?
With non flashed RX480, and not EnableGop flashed BootROM, you won't be able to hold Option key to boot. This is expected, black screen and hang.
By considering both Mojave and Catalina is outdated now. I personally believe there is no need to re-install Catalina if you just want to sell it. You may simple install Mojave, which provide native support to your hardware.
Of course, if you can't even boot your cMP, then it is a bit hard to recover. IMO, the easiest way is to boot from a Mojave USB installer, but you need another computer to make that USB installer.
So If I make a Mojave USB installer on another mac ,(which I can) how am I supposed to use it if I still don't get display upon boot. Is there a version of Mojave Installer that automatically installs it without me having to see the display?
As long as no other boot drive in the cMP. And you inserted the USB installer into one of the native USB 2.0 port. The cMP should automatically boot to that USB installer.
And once the GPU driver in the installer is loaded. Your RX480 will display, and you can continue to install Mojave onto an internal hard drive.
Yes, that should work.
Your MBPro (2015) can boot anything from OS X 10.10.5 (Yosemite) (It shipped with either Yosemite or El Capitan), and can be easily upgraded to macOS 12 (Monterey). It will certainly boot from a macOS 10.14.6 (Mojave) installer.
I mentioned that, because it would be good to test your bootable installer, to make sure that it will, in fact, boot another Mac.
Any bootable external Mojave drive should boot your 2015 MBPro (assuming the drive is made correctly)
You do want to make sure that you are trying a normal boot (plug in the external drive, restart while holding the Option key. Choose your installer from the boot picker screen and press enter.
Does your MBPro boot from that installer? If not, what DOES happen?
Your MBPro (2015) can boot anything from OS X 10.10.5 (Yosemite) (It shipped with either Yosemite or El Capitan), and can be easily upgraded to macOS 12 (Monterey). It will certainly boot from a macOS 10.14.6 (Mojave) installer.
I mentioned that, because it would be good to test your bootable installer, to make sure that it will, in fact, boot another Mac.
Any bootable external Mojave drive should boot your 2015 MBPro (assuming the drive is made correctly)
You do want to make sure that you are trying a normal boot (plug in the external drive, restart while holding the Option key. Choose your installer from the boot picker screen and press enter.
Does your MBPro boot from that installer? If not, what DOES happen?
So the mac sees a boot disk with a system it can not boot. Try removing the Catalina disk and see if the installer boots the mac.
Your Mac is a Mac Pro, correct? there's 4 drive sleds, that you can slide out through the side door.
Just slide out the drive that is your boot drive. Assuming you don't have any other drive that also has a bootable system, that's the only drive that you would want to pull out. Again, it's just for a test to see if that will allow you to boot from the external installer.
Just slide out the drive that is your boot drive. Assuming you don't have any other drive that also has a bootable system, that's the only drive that you would want to pull out. Again, it's just for a test to see if that will allow you to boot from the external installer.
your struggling here, let me add my 2 cents please. restart mac with usb inserted, hold cmd R. in recovery you go to disk utility and erase hardrive(i believe you did that already) make sure there are no other hardrives connected, then close that and should see "install macos" if not, turn off and try again. mac are a bit finicky in this reguard, keep trying until it recognizes..good luck
Yeah, and from experience, not all USB flash drive can boot on the cMP (even the same flash drive can boot on some newer Mac).
If you are really running out of idea, then please burn a bootable CD for your cMP. It's the easiest way to recover. From my own experience, as long as the CD is correctly created, it always work on the cMP (hold C key to boot).
If you are really running out of idea, then please burn a bootable CD for your cMP. It's the easiest way to recover. From my own experience, as long as the CD is correctly created, it always work on the cMP (hold C key to boot).
Okay so we are making progress. I removed sled 1 which has the catalina bootloader. When it is removed I am able to use the Mojave USB bootloader. I haven't tried to install it on another volume yet. Now how do I erase the Catalina bootloader from Sled 1 that is the problem?
Install Mojave on another drive,
unBless the Catalina bootloader by a deep nvram reset (holding cmd-alt-p-r altogether without any pause until the box chimes 4 times),
set Mojave as startup disk by the control panel,
re-insert Catalina drive,
Mount the Catalina ESP and delete the bootloader (you can use my ESP tools for it as it gives the drive made and type),
(https://forums.macrumors.com/thread...opencore-on-the-mac-pro.2207814/post-32382081)
Now you can install Mojave on the Catalina SSD.
What happened:
I assume you deleted the container of the Catalina SSD. That did _not_ wiped the bootloader. Bootloader fakes the machine is a newer one - but this prevents booting Mojave and give the invalid board fault (forbidden sign) and shuts down after about 30 seconds. But you did not see the sign without a GPU with bootscreen.
Booting somewhere with a black screen and shutting down after a short delay is a typical symptom for the invalid board thing.
unBless the Catalina bootloader by a deep nvram reset (holding cmd-alt-p-r altogether without any pause until the box chimes 4 times),
set Mojave as startup disk by the control panel,
re-insert Catalina drive,
Mount the Catalina ESP and delete the bootloader (you can use my ESP tools for it as it gives the drive made and type),
(https://forums.macrumors.com/thread...opencore-on-the-mac-pro.2207814/post-32382081)
Now you can install Mojave on the Catalina SSD.
What happened:
I assume you deleted the container of the Catalina SSD. That did _not_ wiped the bootloader. Bootloader fakes the machine is a newer one - but this prevents booting Mojave and give the invalid board fault (forbidden sign) and shuts down after about 30 seconds. But you did not see the sign without a GPU with bootscreen.
Booting somewhere with a black screen and shutting down after a short delay is a typical symptom for the invalid board thing.