Re: pc keeps rebooting without warning
ok got the new mobo (gigabyte EP43-DS3, not great but fine for my needs) with new psu and gpu, installed fresh copy of xp and all seems good so far. been playing fallout 3 with ultra settings with FSAA & 16x AF and GTA iv. if gta iv isnt a stress test in itself, i dont know what is, but for now all is well!
cheers to everyone who posted