Starting two days ago from this post, my computer did not turn on after several attempts. After waiting a few hours, it turned on, but while I was on it for about two hours, the screen randomly went black. I touched the mouse pad, pressed buttons, and nothing happened. I had music playing on spotify, and it never stopped playing. The computer did not shut off until I shut it off. Back in Sept. 2012, my computer would randomly shut off. I thought it was overheating because the fan would start spinning really fast. I got my fan cleaned thinking this occurred because dust was on the fan, but the problem continued. This wouldn't happen everyday, but it did happen often. It hasn't occurred in about 4 months, though. I was thinking that some software drivers needed to be updated. Whenever the HP PC check runs and shows me what needs to be updated, I attempt to update these things, but they mostly fail to update. I've had success updating drivers for my printer, but not for the BIOS. I'm using a HP Pavilion dv6636nr. I've had it since 2007. Any help would be appreciated. Thanks.