I got my laptop about two years ago. It stopped charging around Christmas, then, an hour later, it started turning off when ever I plugged it in. I took it in to be fixed. First they replaced the power jack, it still didn't work, so they replaced the adapter. then, finally, they replaced the mother board. I only just got it back yesterday. I took it home, and it was fine. For the first hour or so, that is. It suddenly shut off. No warning or anything. I turned it back on, it booted up just fine, like nothing ever happened. 45 minutes later it did it again. It has been doing this ever since. My comp is made for gaming, and has a beastly cooling system. I've been checking to make sure the fan is working. It happens randomly. I can be playing a game, surfing the web, or just letting it sit idle. It never happens right when I boot up. It always runs about 45 minutes to an hour before shutting off. It doesn't have any problems booting up. Any tips would be nice.