Laptop Display Problems

Probably not. You'll likely need a new motherboard. What's your current card?

Thanks for answering. Under "Display Adapter", the laptop shows "ATI Radeon Xpress 200 Series." Is there any way to tell for sure that that is my problem?

If you replaced the screen, that rules out the screen (well, it still could be the screen, it just makes it many times less likely). The only other thing related to video is your motherboard. In that regard, I would take the unit apart and make sure no heatsink got bumped around and is making it thermally unsound. I really doubt that will fix anything...but it doesn't cost a dime and it's worth a try.

Else, your motherboard is bad. Since you've an X200 GPU, that's integrated into your motherboard - which is what leads me to believe that's your issue.