Booted into recovery and used disk utility to repair both drives. So the question is, why does the BIOS not recognize OC on the EFI partitions on those drives? I don't know. However, I can boot from OC on the USB drive and then boot either Big Sur Primary or Big Sur secondary. BIOS does no longer lists OC as a boot option even on my Backup drive and still doesn't list it on my primary drive. This worked but resulted in the following condition:ДҐ. I used CCC to make a bootable backup of my primary drive which entailed erasing my backup drive. BIOS brought up OC and I was able to select my primary Big Sur, Back Big Sur, Windows, and Linux.

I installed OC 0.7.5 on both my primary SSD drive and on my Backup drive. Things were working so I didn't worry about this, but this is the root of the problem I'm about to describe.ДЈ. I noticed some time agothat BIOS used the OC on the Backup external drive not the internal SSD drive, although the EFI partition on both drives contained the exact same file. I have OC installed both on my Big Sur SSD internal drive and my Big Sur Backup external hard drive.Дў. Maybe someone has seen this before and can offer some advice for this issue:ДЎ. hoping you are familiar with this issue and much gratitude in advance.

So, if you really think this is a certain part, I will go looking for it, but it is quite difficult and expensive for me to try replacing all 3 of those when I'm not sure they are related. There are a bunch of Console screengrabs from the moment of shutdown and more details in the original post (<-linked). Once it's switched off I can only reboot the computer to regain functionality. Happens more often when using the ports on the front of the computer, or the USB-C expansion card, I get the DumpGPURestart error in console and a lot of 'AMMuxedDevice Disconnected' issues. But I don't think any of these are related to the issue I'm having? Correct me if I'm wrong?Д«asically, the GPU seems to switch off semi-randomly. So I read your build and saw that maybe my hard drive wasn't the best choice for my OS (Samsung 970 EVO) and not to use 'pikera' for my Vega 64 (I'm not) and that the Fenvi T919, which I have, causes issues waking for some people.

I am hoping you can help me narrow it down, because I built the computer in the US (originally in Sept 2020) but then moved to Europe where parts are expensive and difficult to obtain. I wish I saw this thread before building! Hi! I was sent here after asking for help in the another hackintosh forum about my random GPU restarts/screen shutdowns. Building a CustoMac Hackintosh: Buyer's Guide

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