Did my PSU damage my GPU?

[DEL 707]

Been a bit of a week, while playing Baldurs Gate 3 my PC completely died, wouldn't turn on.
Thankfully I had an old 750w PSU spare, so I threw that in and everything looked fine. Ordered myself a MSI MPG A850G and kept my PC use light, until it arrived today.

I put in the new PSU, started playing BG3 again and after about 20 minutes, I got a black screen with no responsiveness. Shut down the PC, fired up BG3 and the same thing happened again after 20-30 minutes.
After playing around with a few tests, I noticed that when I ran FurMark, I would immediately get the black screen. Maybe 1 in 10 times FurMark would work with no problems.
Put back in my spare 750w PSU, same issue.
Reset my BIOS to get rid of my undervolting settings and turned off my RAM XMP, but the problem persisted.

Thankfully I managed borrow another graphics card, Geforce 1060 to replace my Vega 64. Ran FurMark everytime with no problems. Even with my overclock settings turned back on.

Put my Vega 64 card back in, 1st time it ran FurMark fine, did a restart and now it's been pretty consistant with the black screen.

Rechecked the PSU connections multiple times. My card takes 2 PCIe connectors. I've tried 1 lead with a daisy chain and 2 seperate leads, with the same results.

What is the likelihood that when my PSU blew it did something to my graphics card?

Specs are -
MSI MAG B550 Tomahawk
AMD Ryzen 7 5800X
Teamgroup-UD4-3200 8gb x 2
Gigabyte Radeon Vega 64
MSI MPG A850G

 

[DEL 707]

Yeah, I changed the cables.

Not using a riser.

I've got 2 monitors. Happens to both screens.

When it black screens, pc is non-responsive. No sounds.

 

[DEL 707]

Temps were nothing too concerning in games, about 80. Was also getting the same temp in furmark, when it worked.

I'm going to go along the line that the GPU is buggered and replace it.

 

[DEL 707]

Replaced the GPU on Saturday and so far, no further crashing.