what part do u not under stand? btw i am pretty sure its the video card
It just might be the moniter itself because from what I'm hearing your moniter seems like its pretty old. Its not a flat screen is it??? I know a moniter that does the exact same thing with the Red, Green, and Blue boxes that come up at my school. We use them to do graphic arts and other stuff. They're pretty crappy, but back to the point.
Its probably the moniter, and the video card should be fine. Your moniter is probably too old just go buy a new one. A flat LCD screen is a great deal.
* Takes less electricity to run a flat screen
*Visually it looks better.
Here are some good deals. I personally like Fry's but if you can't find it here are some Newegg Moniters too.
http://shop1.outpost.com/product/5177486?site=sr:SEARCH:MAIN_RSLT_PGhttp://shop1.outpost.com/product/4952641?site=sr:SEARCH:MAIN_RSLT_PGhttp://www.newegg.com/Product/Product.aspx?Item=N82E16824009118note ACER is not my favorite. I've heard a lot of bad rumors about ACER computer parts so ya, but this one's real cheap, and its LCD so your choice.
http://www.newegg.com/Product/Product.aspx?Item=N82E16824001240Samsung is one of my personal favorites. They always seem to give quality products, but this is a bit pricey. If your got the money though this is worth it.