Hi, I've had this problem for a while now, and only just starting to get annoyed enough to try and fix it. What happens is about once a day the sound on the computer stutters and then the entire thing freezes up. The screen stops moving and I have no control. The program I have running on my G510 screen stops working too, so its not just the screen freezing. Because I can't do anything I have to hard restart it by holding down the power button and then turning it back on. I first thought it was a virus of something so I ran as many virus searches as I could, but that didn't fix the problem. Then I tried updating every driver I could find, but that didn't help the problem either. Finally I thought it would be a problem with the RAM so I ran memtest 86 over night and it said that there was one error. Ok, so theres something wrong with the RAM. next I tried taking one stick out that I thought might be the bad one and ran the memtest overnight again. It said there wasn't any problems so I figured the other stick was the bad one. Last night I ran the memtest with the other stick of ram and again it said there wasn't a problem. Now I don't know what to do because I don't know if there was a problem with the way I ran the memtest or if there is something else wrong with my computer. Thanks for any help that you can give.