pc shuting down prematurely

  HOPE 18:39 23 Jun 05

My pc shuts down suddenly and totally roughly every half hour after use, the only sign of life is the light on the front of the tower flashing.If I switch it off at the mains and leave it for about 20 minutes it will restart every time. My pc is a four year old mesh with a 900 athlon asus motherboard and I have widows xp.I have tried a new graphics card but this has made no difference.Can anyone give me any advice on where to start.
Many thanks steve

  Fruit Bat /\0/\ 19:12 23 Jun 05

Usual reason is overheat use
Motherboard Monitor (1,736K) click here Monitors temperatures etc. to see what heat the case and CPU are ruuning at.

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