My friend's PC has this config:
Intel Pentium D 3Ghz, Intel D945GCNL, Transcend 1GB DDR2 667 and a Local Tier 3 PSU.
The computer, off late has been shutting down randomly. When this happens, CPU fan stops, display blanks but num lock works, power LED is lit and no beeps. And most of the time I cant get to BIOS. I have unplugged all other devices (data and pwr), things running and connected are the PSU, MOBO, CPU.
Things I tried:
1. Overheating: Replaced thermal Compound and started. Issue persists. Temp seems to have reduced last time I made it to the BIOS. Also I removed the HSF and tried it, the board sounded a siren. When the HSF was the there with the TC no sirens.
2. PSU: Cannot replace for some time now. I unplugged all pwr cables except the 24 Pin and the 4 Pin.
Read the voltages with a multimeter and the voltages are within limit(+- .5v).
I shorted the PWR GOOD with GND and started the PSU w/o the mobo and it runs fine, no shutdowns and all proper voltages.
3. Unplugged RAM and tried: Same issue, goes to the boogie state. Sometimes it beeps the error code and then goes there.
4. I guess the CPU did not fail, it did its job and got detected every time I got into the BIOS.
5. Reset the jumpers, no use.
Did the motherboard fail, or is there any method to confirm mobo failure before I buy a new one? Also could the cabinet switch and any other front panel connectors cause this kinda errors? Any other component failure possibilities?