My laptop keeps on crashing. It is an Asus Republic of gamers laptop with Intel core i7, the OS is win7 premium, the ATI mobility Radeon graphics is HD 5870, 1 terabyte storage, and 8GB Ram. If I were to play a high graphic game it would randomly crash and show a black screen with gray lines overlaying, I have to manually turn off my laptop to make my laptop go back to normal. I do not know what is wrong with it and I hope I can fix this problem as soon as possible.