GPU Randomly Stops working?

[Cian]

So recently i've started having this issue when I could load up a game or something and my monitors would just shut off and would say they are not receiving an input from my GPU, now this is where things get weird, my PC is still on, the light on my GPU is still on, ALL fans are working and still spinning but I cant power off my PC via the front i/o power button, I have to switch off my PC via my PSU. I initally thought this was an overheating problem but I ran stress tests for over an hour with no problems or the computer shutting off at all like previously described, but as soon as I loaded up a game (CSGO) it happened. Any help or insight to what may be causing this please let me know, Thanks!

 

PC Specs:

FX-8350

Gigabyte 990FXA-UD3

Sapphire R9 280x Toxic Edtion

Corsair 700w Gamer Series PSU

[Tedster]

I think that your PSU is at fault - could you test with a known good unit?

[Cian]

The only other PSU I have in the house is a CX430 which wont be able to power the r9 280x, Ill look into ordering an EVGA 850w from amazon, or do you recommend I go with something else, thanks for the reply!

[Cian]

Just got on to Corsair to see if I could get my power supply RMA'd gonna have to wait and see what they say!