I've been getting a large amount of Machine Check Exceptions since building my current system. With one exception, every single time I have gotten an MCE I was playing a video file (26 total in the last three weeks). When I don't get MCEs, the power simply shuts off for no apparent reason. So far that has never happened when I was actively doing something, only when I left the computer with a few programs running. I have a 600 watt power supply and no graphics card, so I refuse to believe its an issue of not having enough power. Here's the rundown of my system specs: MB - Foxconn 6150K8MA CPU - AMD Athlon Dual Core 3800+ (Socket 939) RAM - 1GB DDR (4x256, two are generic, two are Kingston) PSU - OKIA 600W HDD - Seagate Baracuda 160GB OS - XP Pro (no service pack) DVD -Toshiba S-DR5372, NEC ND-3520AW I've gone through all of the common sense things, like rebuilding the page file, running chkdsk, getting rid of dust, etc. Memtest86+ says my RAM is fine (for whatever that is worth) and Everest says my CPU is not overheating. I'm not overclocking either. Any help with either or both problems has my thanks in advance.