I just got a new PC, and it's been running fine for the first week. However, lately when I've been visiting blogs, some links cause my computer to shut down, mostly ones with video plug ins (no, it's not porn). My computer gets really slow, my monitor starts to turn off and on, then it eventually turns off. I can run heavy games like Battlefield 2 with no problem at all, but going on the net causes crashes. Any idea what's causing this?