@SuperMeatyMike
Just to confirm, is the display just stuck like this or is the system frozen? If you're not sure, try to press the "Shift" key rapidly for 5 seconds and see if you're hearing a system sound.
Please list your full system specs.
Windows 10 or 11? Lets start with bluescreenview: https://www.nirsoft.net/utils/bluescreenview-x64.zip
With the freezing it may not log anything, but lets check. Any information is helpful at this point.
Tells us the drive is inaccessible. NVME is PCIe along with the card, which gives us a common link here at least. The drives should be wired through the chipset though, while the GPU is wired directly to the CPU. I'd test with a single drive installed.
The second GPU. Was the behavior the same or worse?
Could be. Could also be that you have a flakey PCIe 8 pin on the PSU, it would be one of the connectors at the end of the cable, but since we have three 8 pins, we need to use that one. Could try switching to the other 8 pin connector at the end of the second PCIe connector. I'm thinking it potentially caused a false positive failure on the first card. The new PSU will tell us for sure.
It's possible. Check your registry: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{36fc9e60-c465-11cf-8056-444553540000}
See if there are any lower or upper filters set.
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