While i am doing something on my computer it will randomly say monitor going to sleep with a blank backround then gose off. Then i am not able to turn it back on and i must restart my computer in order to make it work. Also on top of that my computer freezes. It usally happens when i am watching a video or flash movie or at least i noticed it more during something like that. Things i tried and know. I have tryed the power supply thing and every is on never. My video card isnt overheating with my first problem because it happened with in seconds of booting my computer. Tho i dont know about the freezing. My monitor is a HP vs17e My video card is a Geforce 7800 Windows XP, Asustek motherboared, Intel pentium 4 524. Made by HP My video drivers are up to date along with Direct X If theres anymore info i must provide id be happy to.