laptop shuts off

Ever since I installed suse 10.0 my laptop it shut off at random intervals. Could this be done by the OS ? how can I narow down the trouble software or hardware ? Before Suse I have had the laptop for two years with the following OS with problems not related to the computer shutting off Winxp x86 = 1.5 years (dual boot) Suse 9.1 x86_64 = 8 months (dual boot) Fedora x86 = 6 months (dual boot) Debina x86_64= 4 months (dual boot) current = Suse 10.1 x86_64 by itself no dual boot I had trouble with the other OS's, but it was because of a bad memory module, which I replace Computer details hp pavilion zv5000 cpu = amd 64 3000+ mem = 1GB thanks for any help