Question PC booted one time after new PSU, after a hard reboot it will not boot anymore

[Collserra]

Here are my specs:
https://pcpartpicker.com/list/gqZtV6

And the old PSU:
https://pcpartpicker.com/product/FQ648d/corsair-power-supply-cp9020101na

I suspect the video card is unstable - the reason I bought the new PSU is actually because the PC crashes when I run FurMark, and someone suggested that my PSU wasn't enough to run the system.
After installing the new PSU, FurMark still crashed the PC, and now it will not boot back up.
I'm terrified that this means the GPU is a goner, but I was just hoping for a second opinion.
This is the first time I've built a PC myself, and I'm pretty vanilla as far as troubleshooting it goes.

Thanks in advance for your time

 

[USAFRet]

"new PSU"

Please tell us that you swapped out ALL the cables associated with the PSU.

 

[Collserra]

"new PSU"

Please tell us that you swapped out ALL the cables associated with the PSU.

Yes, the old one was semi-modular and the new one completely modular; I swapped them all out with the ones that came with the new PSU