I am able to boot up my computer and get to the desktop, whenever i try to play any video games my computer runs very slow then eventually locks up, it never used to have problems, infact it ran well for awhile, my video card is a Geforce 8500 GT. However, my computer also locks up whenever i try to watch videos, not right away but if im watching a show that's longer than 30 mins then i will get these blotches of distorted color on my screen, which makes me think it's a problem with the video card. I also think there might be a problem with my power supply, just because awhile back my computer was locking up with showing any weird colors. I would like to hear your opinion on this matter. Thank you for your time.