Can't change colors, resolution,etc

[Blurry]

I just finished installing my DDR memory on my PC this morning, and everything went well, until I went into the BIOS. It seemed fine, but several of the letters were corrupted, or they looked weird. Then after installing XP, I can't change my color depth or my resolution or else the monitor will go BLACK and the computer will freeze. I don't understand this problem, and its really getting on my nerves. Is it because the video card is dead?

 

[BFG10K]

So you didn't have any problems until you installed the new stick of RAM? If so it sounds likely that it's faulty.