Will a weak PS cause sleep mode?

Krushpuppy

Distinguished
Jan 9, 2006
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18,510
A friend has a computer that suddenly goes in to sleep mode upon entering a graphically intensive gave (EQII,WOW). Just started, doesn't do it out side of these games. Will do it repeatedly, randomly in either game. I was wondering if a bad/weak power supply could do it as the wattage pull ramped up on the entry to the games.