I have a HP Pavilion 6500 that has recently started shutting down for no reason. I have had it completely apart, cleaned and inspected every part. Everything looks good and when I put it back together it worked fine for about 6 hours then shut down again with no warning or error message. When I attempt to restart, it comes on for about 2 seconds and shuts off again. (On battery, battery w/adapter and adapter only) Even when it has sat overnight or for a couple of days and should be completely cool. Someone in another thread mentioned processor protection in the BIOS. How do I check that? Any help would be GREATLY appreciated.