|First determine if its a software or hardware problem. Do this by powering the laptop up into the BIOS screen. If it has the same black bars, or cut off screen appearance, it's a hardware problem. This is most likely.|
For hardware there are a number of suspects: laptop screen, video chip, bios chip (both on the motherboard) and the video cable.
Connect an external monitor, if it works correctly then you know the video chip is okay. The video cable is the most likely culprit as they tend to ware out as you open and close the laptop lid. This was the problem with my HP dv4. Fixed for $60, parts availabe on the HP parts website