PC restarts and then turns dead
Hi all, i new here.. i troubleshoot a friends PC.. at first i was dead, i opened it, and turns out that it was so dusty inside, i cleaned it out.. It turns on and then after a few minutes or even seconds after, it will restart and then i have a dead system.. at first i thought it was a ventilation problem, bec. the processor fan was not turning properly.. i bought a brand new processor P4fan and installed it.. but it's just the same, it restarts and turns dead... i also exchange the power supply with mine bec it has the same wattage, but its still the same... Not i think its the proceesor that has a problem, or i there something else? is it the mobo? can any one please help?
The system has:
ASUS P4s8x-x mobo
Intel P4 2.4 ghz
GeForce4 MX440-8x 64MBDDR + TV Out
P4 ATX switching PS 300 watts