Posted 20 November 2012 - 12:15 AM
So computerfunguy, I would say that you are correct.
if the lights on the motherboard come on but you have a black screen, external monitor is no dice... it is likely a graphics issue, very common problem with hp and compaq laptops. There was actually a class action lawsuit between Nvidia and consumers based on the faulty graphic cards and heat sinks. You see, the heat sink is not capible of dispersing the heat from the GPU and thus it overheats and bubbles out of the board. Unfortunately, you are past the warranty for the lawsuit. but there is a smidge of hope:
If you are up to the challenge then you caan attempt to reflow the video card. there are several tutorials on youtube that will show you how to reflow it. (basically resolder the GPU to the motherboard with your kitchen oven) Some have good luck with this a long term fix while others don't have much long term success. I would reccomend that you do some research, some people put in copper shims. I even seem one kid bore out custom ventalation pores in the bottom of the laptop case.
Good luck. Let me know how you make out. Or if you have questions!