MacBook Pro: Distorted video or no video issues?

ScreenSnapzthumb
(click on the image to enlarge it)

I own a MacBook Pro 15-inch model (2.4GHz) with NVIDIA GeForce 8600M GT graphics processors manufactured between approximately May 2007 and September 2008.

Yesterday the computer screen started looking like the image above. I panicked!!!!!

Fortunately the guy at the store where, 2 years ago, I bought it knew about this kind of problem. He told me to check out
this link by Apple.

My MBP is one of those mentioned on the article. I am writing on this very MBP because I have found out that it still works if connected to the power supply but I will bring it to the service center as soon as possible!

UPDATE:

fixed problem at no cost!