XP home will only boot from Last known Good Configuration

Hi

XP Home stopped booting up. It will not boot in either regular or safe mode. Gets to the “Windows is Starting up” screen and the computer shuts off and re-starts. An endless loop.
Fortunately, it will boot from “last Known Good configuration”

no files in my mini-dump.

Tried to do a re-install/repair from XP CD – no luck. Tried chkdsk /r – no luck.

I am currently running a virus scan online from TrendMicro.

Any other ideas?

Colleen