I was planning on simply replacing the P/S when she advised me that after she found it beeping, she shut it down. It hasn't done POST since. I tried removing all but the vid card/RAM and found it would start to POST with all system, vid card and cpu fans coming on and mobo power led green but then system would shutdown. No warning beeps. Seems like p/s is protecting itself.
swapped out DDR DIMMs for a working set and no help. Mobo is INTEL D865.
I got a free PS testor with replacement Coolmax P/S and results were: 20-pin: 12, 5, 3 V all ok, led worked and got OK beep/ HD connectors: 12 & 5 V OK/ 4P connector: 12 & 5 V OK/ FDD: 12 & 5 V OK.
Then I checked SATA connector and got 12 & 5V OK but no 3V signal. ??? According to tester 'manual' SATA should be positive test for 3V also. Leaving SATA disconnected has no effect on booting. Also SATA is my storage drive anyway not boot; boot drive is IDE.
What is most likely culprit. Have new P/S & a spare P4 CPU & vid cards.
Edited by seacraft, 19 January 2008 - 09:18 PM.