My self-built Win XP Pro MCE machine will not boot. The BioStar splash
screen comes on, but then the machine shuts down before the P.O.S.T. info
displays.

BioStar mobo, P-4 3.0 GB dual core, 2 GB RAM, 80 GB Hitachi IDE HDD, one LG
DVD IDE combo drive. Multi-slot card reader (no cards inserted), no floppy
drive.

I've unplugged all peripherals, including the LAN cable. The machine is part
of a 6 box LAN. All was fine at last shutdown after an update of MS
Defender.