Anybody here bother fixing computer motherboards these days? I have
seen a few that just need capacitors replaced, but what about the ones
where the power supply took out the board, are they fixable?

I have an emachines motherboard (K8MC51G) that powers up when I push
the power button, but doesn't post of even beep an error code. Seems
to be a common problem, the PS it came with still works (tested in
another system), and there are no burn marks or capacitors bulging/
leaking that I can see. Was wondering what could be the problem (used
different CPU's, RAM, and a new 550W PS). Is there a common fix for
that model?

Are those PCI/ISA post boards on ebay useful for figuring out MB
issues?