My brothers computer keeps shuting off by itself

MTB

Member
Jul 16, 2000
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Right now my brothers computer will just shut off and not come on for like 20 minutes.... then it shuts off again.... I thought it was is CPU but he got a new one and it keeps doing the same thing. I think its his power supply.... but not sure. What do you guys think.

His comp
p3 533 eb
Asus P3v4x
CL Anhhilator GTS 2
384 meg of ram
40 gig wd 7200rpm hd