Not sure what it is, thought it was overheating so I bought a nice fan base, still happening during "semi" intense moments, watching a movie? playing hl2:ep1?
intelcore2duo t7200 2ghz
2gigs ram
Nvidia geforce go 7600
back when psus were uncommon over 400w, testing stability of them wasnt that uncommon, as a lot had drooping rails causing instability. now a days the quality control is much better.
this will probably absolutely no help but i had a similar problem with an msi laptop except it never turned back on...i sent it to them and they returned the same notebook repaired. i wish they wouldve let me know what happened to it.