MP 1,1-5,1 No boot after changing boot volume

[crystalidea]

I have MacPro5,1 (2010) with 2 boot drives: Mojave and Windows
After inserting the 3rd drive with Catalina B7 and choosing this volume as startup the mac shutdowned itself. I removed the Catalina drive but it no longer boots!
I hear the chime, staring at black screen for couple of minutes and it shutdowns.
Leaving only macOS drive didn't help. PRAM reset didn't help. I have RX580 Saphire

PS. After the boot chime I remember my RX580 fans stop, but now they spin unless mac shutdowns.

Any ideas? Is it bricked now??
Thanks

 

[tsialex]

Install a GPU that have pre-boot configuration support (Mac EFI) then clear NVRAM three times in sequence.

If still not work, you probably have a brick (or maybe something else died).

 

[crystalidea]

Thanks for the answer. Unfortunately, I don't have such GPU now. Next week I'll try the RX580 from Macvidcards and post the results here

Resetting 3 times NVRAM didn't help

 

[tsialex]

Thanks for the answer. Unfortunately, I don't have such GPU now. Next week I'll try the RX580 from Macvidcards and post the results here

Remove all your disks, insert a createinstallmedia USB key with HighSierra or Mojave, clear the NVRAM 3 times. If your Mac Pro still works, it will boot from the createinstallmedia USB key and you will have working display after the GPU drivers are loaded.

 

[crystalidea]

Ok, it booted high sierra installer with only usb 2.0 connected. After I plugged back the mojave drive (1st SATA), the situation is the same: no boot and it shutdowns itself.

 

[tsialex]

Ok, it booted high sierra installer with only usb 2.0 connected. After I plugged back the mojave drive, the situation is the same: no boot and it shutdowns itself.

Connect an empty drive and install High Sierra, then after everything is working you debug your Mojave disk.

 

[crystalidea]

Thank you, fixed. No idea what happened, after installing highsierra on a temporary drive, I put mojave, windows and catalina drives back and it's all good now. I'm now afraid to boot catalina even with no-boot-args.

 

[crystalidea]

Will wait for a GPU from MVC...

 

[Flacko]

Will wait for a GPU from MVC...

I have had a similar experience with a configuration similar to yours. See the post just after your link in cMP5.1 Catalina thread. It appears switching drives in my Mac using system preferences in Catalina corrupts the startup disk part of the NVRAM. The only way I have found to reliably fix the NVRAM was to install a Mac efi graphics card (GTX680 in this case) and set the boot drive using the startup disk manager. I have left the GTX680 in the Mac for now and switch OS drives using the startup manager. This seems to work. When all settles down and the beta phase is over I will put the RX580 back. Having an RX580 with boot screen sounds great but is a bit pricey!

 

[owlinksy]

Hello I have a similar issue with a MacVidCard Evga Geforce 1080ti that was working great for a couple months. Then I upgraded my High Sierra to 10.13.6 (17G8030) and I now no longer have a boot screen, and have glitching when dragging screens around. I now have to put my GT120 in to get a boot screen. I have reached out to MacVid Cards, but have had significant delays with them in the past, and I am hoping I can troubleshoot, but have no place to start. I have done NVRAM reset, and SMC, and still not boot screen from 1080ti.
I would be grateful for any support in this issue!