pc reboots

[god31m]

ive just built a system for a mate(not the first)and have came aross most problems but this one is doing my head in....Everytime i start a game (americas army)the system reboots itself.Have installed it many time before never had a problem

xp2000
128mb fx5200
80gig hdd
256 drr 400
directx 9.b

any suggestions
thanks steve

[brad]

I'd make sure my video card drivers were up to date or reinstalled, first.
Does this happen on all games?
It could be Power Supply or an overheating issue.
brad