So, recently (as of thursday or so) my PBG4 has been making weird buzzing noises, usually only when it was working hard (or watching things online). Eventually, as it got closer to the weekend, the noise started to get louder whenever it would come on, so I'd just turn off my computer for an hour or so and let it cool. Finally, today, I turn it off again and now whenever I turn it back on, all I get is the gray start up screen, sans spinner. Sometimes I even get a little folder with the mac face on it. What's wrong? I pray to God it's not totally dead. If I can even harness all my files from it, I'll be fine.