Is my gpu dead?

Hey community,

I was playing portal 2 one day when suddenly my screen turned black.
I rebooted my Pc. But when I tried doing that I booted to the normal home screen and the screen turned black after around 10sec. of usage.
I thought its my gpu, so I swapped it with my old GT640 and everything works.
I thought it's my r9 270x 4gb that died, but then I rebooted it into safe mode and it works. And it even gets reconized by the device manager.
I tried un/installing the drivers but that didn't fix it it. Its also not the psu fault because he power leds on the gpu are both green. I tried this gpu in my friends PC and it didnt work as well.
Any Ideas?
THX!
 
It sounds like you are right and there's a problem with your graphics card. Maybe you get a decent warranty period with an expensive card?
 
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