GPU dead?

[Overpriced CPU]

 

So I have been playing on my pc for almost 3 years now, changed out the powersupply recently cuz I had some problem with my pc crashing all the time, as in all of a sudden there was no juice in my pc, black screen, all lights off and fans stopped spinning. When I changed the power supply it was working fine and had not crashed for a full week (before it crashed often when trying to play more heavy games). So I thought I fixed it. While all of a sudden when I launched a more heavy game again ("Grounded") it also crashed but in a different way, this time my 2 monitors just gave a "no signal" message, but my computer was still running. I tried to turn it off and on again but then it did nothing at all tried pressing the button a few times, still nothing. A few hours later tried turning it on again, now it did turn on but again no signal to monitors. Grapped an old GPU we had laying around and this time it did work, so I came to the conclusion that my GPU died. Unfortunatly its hard to get a GPU this time around.

What can I do try resolve this problem?

 

Specs:

GPU (the one that I used before) GTX 980 Jetstream

GPU (the one that I am using now) EVGA GTX 780

PSU (the one that I used before) Corsair VS550

PSU (the one that I am using now) CoolerMaster MWE 230V 550

 

Thanks in advance,