PC stops and restarts at start up

  swapper 07:43 08 Apr 09
Locked

Perhaps 6 out of 10 times, when I start my PC, it will start up and then stop immediatley for about 4 or 5 seconds and will then run fine.
Any ideas please?
tia

  birdface 07:57 08 Apr 09

Maybe PSU on the way out.Or check the air vents are not clogged up with dust and fluff.If so Inside will also need a clean out.Make sure all fans are working and clean .

  swapper 19:48 08 Apr 09

sorry buteman, I should have added that it is a new (4 months) motherboard with PSU, Windows XPpro SP2.

It is very clean inside.

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