Hey guys,I think I've got an issue with my gpu.It started around a month ago,until then it was working perfectly.While gaming sometimes after a while(coulde be 15 min,could be 3 hours) the screen goes black and i have to shut the power from psu button(since i cant even restart it).The pc is still running with the black screen,all the fans spinning etc but i cant do anything.It doesn't happen in all games,just some:witcher 3(first game i encountered this)batman arkham city,prison architect,etc.At first,i thought it's the psu that doesn't supply enough power(have it for 3 yrs) but it should just completely power off.So my bet riht now is the gpu.Any solutions?*sorry for long post*