Hello. i've posted about this problem before a few months back but instead of reviving that thread and confusing people i thought i'd start anew. resets, restarts and reboots are used interchangeably here. to me they mean the same thing. the story: i was into L4D2 gaming quite a lot but suddenly i noticed that the PC would reset after 10 or so minutes of gaming. googling around pointed me to one of two possible failings; either the RAM or the PSU. needless to say i've bought new RAM and a new PSU and tested the machine with each. yesterday i was playing the new Gothic 4 demo and the same thing happened, after about 10 mins of play the machine restarted itself. i was in stunned bewilderment. i don't know what could be causing these restarts. i'm thinking the CPU might be the cause, but does anyone know what else might cause this? this PC is stable for hours when idling and doing little to nothing. it's only when under more activity like playing a graphically intense game, although i do doubt it's the gfx card as that would show artifacts or just freeze.