random shut offs

[bbordwell]

my friend has a computer that has been acting up....it randomly restarts even when i tried reformatting it it would shut off when windows wasnt running....i thought it could possibly be a powersupply problem but i wanted to ask the forums opinion...the ps is a 430w coolmaster the system is pretty low end just a celeron and a fx5200 1 hard drive 1 optical drive....what do you guys think is going on?

 

[Devnull]

Likely problems(in order of probability):
PSU- Test voltages with multimeter under load.
Memory- Run memtest.
Mobo- Good luck if that's the problem.

Make sure automaticly reboot is disabled in windows so you can see if there is a BSOD.

 

[engiNURD]

and if there is a bsod, report the error code along with the parameters and any other info, if possible.