Asus board - P5VD2-SE
Intel Pentium D 2.8 GHz CPU (Socket 775)
HDD is Western Digital
Spire Quadroflow V (Socket 775) heatsink & fan
512 MB of Kingston DDR2 RAM
Has a 500W PSU (unsure of brand)
When he first installed these components, the machine fired up and ran fine for several minutes at which time it froze itself up. He rebooted and thereafter, when the power is turned on to the PC, it will activate the CPU fan for a few seconds and that's it - the fan stops and nothing else happens. At all times, the green light on the mobo remains lit. We changed out the PSU and the problem persisted. We exchanged the mobo, but still no luck. Everything seems to be connected correctly, and the fact that the machine started and ran for a few minutes initially is quite puzzling to us. I hope I'm being descriptive enough with the symptoms, but I will do my best to answer any further questions any of you may have.
Thanks so much in advance for all your assistance.