GPU or PSU fault?

Mario · 1 Jun 2015 at 18:22

Hi all,
Few days ago my pc started crashing during games
While im in windows,doing simple tasks like surfing on internet or watching movies,no problems,but as soon as i launch game (any game - BF4,Witcher 3,Elite Dangerous) pc crashes,monitor goes into standby as if was there no signal,and any keyboard combination not working at all,helps only reset button,pc crashes only in 3D.
I changed my gpu 1 month ago,so im thinking it might be the source of problem
My psu is old as well Corsair HX750W(bough it in 2011 Dec - but it serves me extremely well so far),specs in my sig

P.S.i only have spare gpu (7950),no psu,and cant get it anywhere - if i swap gpus and if there is no problems,can i be certain that is bad gpu then?

Mario · 1 Jun 2015 at 18:48

I reinstalled Windows,clean install,still crashes

Mario · 3 Jun 2015 at 11:34

right,now its even more "funnier"..
after putting old gpu seems pc not crashing - but now after playing few min sound always disappears on whole system,only restart helps - im puzzled now what is broken in my system

and all problems start only when i start games

Mario · 3 Jun 2015 at 12:27

yep,i cleaned pc last week (doing it quite often)
temps: 100% load cpu never goes higher than 54C

BTW - when sound was gone after few min in game i tried to watch youtube videos,and they were on kinda slow motion,or more like 1fps
driving me nuts all those problems

reading other threads make me think maybe its mb ?