Is it a graphic card error or physical damage?
For the former I guess you know what to do - reinstall stuff, update drivers etc. and for the latter you'll very likely have to ask a specialist (or google). Hope for you that it still has warranty.
Looks like someone hit the screen with a baseball bat. :|
Hmm,i had this kind of problem before., what i did was, I installed some new updates for my video drivers. And magically, it was gone.