i have Sapphire HD6790 + Amd phenom II X4 955 be , Ram 3x2GB , silverstone 550watt (80+)
i run my pc on windows 8 pro x64...
ive run my pc for a whole day just for download , and its ok , no problem ocurred.
but when i turn to play games (such a DOTA2, prototype2 ,etc) just for 5 minutes , then my display blank and turned to "Power saving mode" , but the PC still Run. ive already press any key but it wont wake up, so it must be restart.
ive tried re-instal OS with win 7 , and win 8 , that problem still ocurred.