chauffeur2

wolfwiser,

Did you get the CPU checked before you reinstalled it?

The reason I say this is that your last motherboard suffered some major 'frying' and it could have damaged the CPU, and the fault might not be apparent until it has been in operation for a while and starts to heat up.

Also, when you reseated the CPU, did you clean it up and replace the thermal paste? Failure to do this will cause grief too.

As far as a power surge is concerned....did any other electrical appliances in your home malfunction that you noticed...even for only a second or two?

Have you tried using a different power outlet in the house, because power sockets are expendable items too, and the last hiccup could have also done internal damage to that as well.
If you can get the troublesome machine to boot up, download Everest™ Home Edition [from my signature]; then give us the temps from the "Computer Section" under "Sensor".
This will throw light on to the fact about the CPU temperature.
Post back with the results.