Does your laptop have a seperate VGA out? To a stand-alone PC monitor? If it does, try it on a second monitor. If the picture is still broken, it would seem like a graphics error. If it isn't, the screen image is fine, it would seem like a physical laptop screen problem. Not the greatest advice in the world, but it may whittle down what potential problem it could be.
I've not got a VGA cable anywhere unfortunately. This is what i'm faced with, sorry about the darkness, took the pic before I went bed last night.

