Just another GPU related issue. This is a HP Pavilion DV2000 with display issue. System boots up fine but the display shows multiple images. If you try to test it on an external monitor the option will not work. Meaning when you connect an external monitor to the laptop and hit Function + F4 nothing will happen.  You can use the same DIY guide from www.msbin.com to correct this issue. 

dv2000-issue