They told me that my LCD is not working properly so need to change that. And you know while the HP Authorize Service station guys told me Around Rs 23,000 for changing the LCD. Apple did the right thing when they uncovered this flaw: So I dont know why they wont repair mine. It turns out that nvidia has admitted to the problem and has agreed to pay HP $200 for each unit repaired. Unfortunately I am a few months outside of warranty so I have no recourse - I have to pay them two hundred dollars to fix it, and only 90 days warranty for the 'fix' - Last time they fixed it, it failed again - so I don't see the point of giving them $ to fix it. I encourage you to google : '10 symptoms defective laptops screen black nvidia' YOu should read the information. I sent back to HP for repairs, and the same problem recurred within a few weeks and then went completely black and is unuseable now. I had similar problems with flickering screen which got worse.

You should make absolutely sure you do not go out of warranty. There are known problems with many nvidia graphics processors.