My ASUS AV7266 m/b has a built in fan (very small). It was working just fine for about 4 months or so, but now it will get "stuck" and won't spin up. If I open up the case (with the power on) and nudge it a bit it'll spin up. Any ideas how to fix this? I'm guessing that it's dust clogging the bearings, but I'm not too sure how to open it up since it's connected onto the m/b.