This has been going on for awhile. Usually anything from a site-specific video player(Comedy Central, NBC, Hulu, but not usually YouTube) will play for a little bit, then my computer will just crash. Lately, a new wrinkle is that instead of re-starting, the computer will just re-boot and then immediately crash again. This seems to coincide from when I added a gig of RAM to the computer. It's a HP pavillion, a704