Every time i play a game after a while it starts to go black then back to normal ,after it does that a few times the blue screen appears and i have to shut it down manually.
Video Card: ATI Radeon X1550 Series
Driver Version:atiumdag 8.593.100.0(Catalyst 10.2)/Win 7
It does this in the games: Rise of nations, Call of duty 4/6, League of Legends.
Thanks in advance.Thats an OLD video card and its likely overheating. I have the same video card a PCIe type with 256MB RAM and PASSIVE heatsink that I did away with long ago because it kept overheating playing World of Warcraft and black screening on me. I added a fan blowing across mine, but it still wasnt enough to disipate the heat that GPU created trying to run games, and I think the GPU was slightly damaged from roasting too many times.

I'd swap the video card with another BETTER video card, such as a more modern and powerful ATI Radeon 5450HD with 1GB RAM for just $32 as linked if yours is also a PCIe slot video card: http://www.newegg.com/Product/Product.aspx?Item=N82E16814102882

I am running the 5450HD in 2 systems and impressed with what it RUNS for the price. One is 512MB and the other is 1GB of Video Ram. This video card is also passive and I used my already existing 80mm fan that I installed for my prior Radeon x1550 to blow cool air across the heatsink.