Acer :: Aspire 5739G Irregularly Crashes

The Aspire 5739G I purchased from Newegg in July has been randomly crashing on me.

Windows completely freezes without BSOD, I can't move my mouse, the sound skips repeatedly, and the keyboard is unresponsive (num lock won't turn on) which forces me to manually shut down with the power button. The screen flashes a bit before the crash happens.

I first experienced these problems after I installed Windows 7, but I reset to factory defaults w/Vista and the problem still remains. After two fresh installs of Win7 and one of Vista I am stumped. I also ran the Western Digital HDD, memory diagnostic tool, and mem86 and they all didn't find any problems with my hardware.

The crashes have occurred in Excel, playing flash movies, games, but mostly in playing videos. However the crash is completely random. I have tried both media player classic and VLC with different movies and windows has crashed with both. Not to mention that the same video that crashed my computer, I can play again with no problems or it will crash again at a different spot so it's not a corrupt file. Also I've tried both official and unofficial video card drivers and that didn't work. Event Viewer also doesn't tell me crap.

My laptop is still under warranty but I'm afraid Acer won't take it back or do anything if the problem isn't obvious. I once sent this laptop in for a noisy fan (loud buzzing noises) but they sent it back without repair since they couldn't find anything wrong with it. Even though the fan is noisy, speedfan says that temperature is kept cool and I'm also using a laptop cooler.