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Pilgrim
One of my PC's refuses to boot up all of a sudden. Just hibernated XP one evening and the next day it refused to come up, nothing extraordinary happened in between. It starts up but there is no beep + POST. Not had any problems with this PC in a long time, so its curious whats happening now 
P3, Mercury KOB 819 DSMT, with 256MB RAM. Its connected to the UPS so there were no surges that could have done anything untoward as other devices off it still work fine.
So i pulled the memory out as well as the HD IDE cables on the mobo and pulled the monitor connection too. Still the same. The fans on the CPU & PSU come on so that leads me to think the PSU is ok, its an Intex 400W model which replaced the older 250W one so its not at all overloaded.
I tried swapping in different memory cards but that did not make any difference either.
Reset the CMOS, nothing. I dont think a dead CMOS battery would prevent a POST. There is an add-on NIC card but dont think that could affect things either.
That leaves either the CPU or mobo. I'm not sure how to tell where the problem is.

P3, Mercury KOB 819 DSMT, with 256MB RAM. Its connected to the UPS so there were no surges that could have done anything untoward as other devices off it still work fine.
So i pulled the memory out as well as the HD IDE cables on the mobo and pulled the monitor connection too. Still the same. The fans on the CPU & PSU come on so that leads me to think the PSU is ok, its an Intex 400W model which replaced the older 250W one so its not at all overloaded.
I tried swapping in different memory cards but that did not make any difference either.
Reset the CMOS, nothing. I dont think a dead CMOS battery would prevent a POST. There is an add-on NIC card but dont think that could affect things either.
That leaves either the CPU or mobo. I'm not sure how to tell where the problem is.