pc turning off and on in game

[sweinhart3]

the operaiting system is windows xp. i have like 6 fans on it lol everything is connected. the weird thing is that is only in game a friend said it may be the sound card could that be possible? i am using the reltek hd audio... it does not freeze the pc it just shuts off and turns back on i am so confused and dont understand. so i think that is what u are asking for