How do I fix this problem of a pink/green tint on my laptop screen?

All images on my computer screen have a pink/green tint, which makes looking at pictures or watching videos impossible. It is not just the images, even the area around the address bar on the browser has pink tint. If I lift up the laptop and move it back and forth, that worsens the tint (sometimes covering the whole screen!) This is not a new problem. It first happened last summer, after which my laptop had overheating problems too. Then it stopped sometime over fall/winter, and has started back up again a few days ago.

I don’t see what it could possibly be, but I assume it has something to do with heat since it just returned when it is finally getting warmer? I have tried googling, but I am probably not using the right keywords since I don’t know what to call this. I cannot give you a screenshot, because the picture would look normal to you (i.e. no tint), so it’s definitely something wrong w/ whatever is responsible for the colors on the screen.

Other info: this is an Acer laptop (Aspire 5000) that I bought in Nov, 2005. The OS is Windows XP. I already plan on buying a new laptop over the summer, but I want to fix this so I am not forced to use the laptop for only non-visual imagery means.

Any help on the matter would be appreciated.

And please don’t tell me I should get a Mac etc etc since that doesn’t fix the problem on THIS laptop, does it? :)