Hi Guys,
I have just been given a PC as the owner has given up trying to fix an odd problem. It keeps shutting down ... Sometimes I can get it to boot from a Linux live CD and it will run for maybe 5 minuets, sometimes it will only run for 20 seconds or so. I have not been able to get it to boot from the hard drive further than the Win XP start up screen. On occasion when trying to switch it back on again it will not do so. I swapped the PSU (450W switchable type). No difference !! and and I am informed the Mother Board has already been changed. It displays the same habit with or without the Hard Drive (SATA) connected.

Any Ideas???