Well I bought this laptop two years ago from Best Buy.
It is G42 series and has AMD Mobility Radeon HD 4250 and AMD Phenom 2 Processor.
Early this year, its lcd went crazy every color that should be white is cyan, there are white flickering vertical lines on the screen. And there are redish pixels on the black color, it is not os specific problem, same problem is seen during boot up. So it is a hardware issue. I went to a repair shop and he said the lcd cable was causing the problem. He replaced it, charged 25$ for it and it worked fine. After a week, the lcd again went in the same condition. I took the laptop back to the repair shop, this time he fixed it for free, said over heating was causing problems...
Now I am pretty sure that LCD is fine. Since the problem was temporarily resolved without changing the lcd. I am also sure that the graphic card is fine, bacause the display is fine on external monitor.
Now after two months the LCD has gone crazy again. It is the exact same problem. Occasionally the lcd/ display becomes normal for few minutes but then back to abnormal again. So I think it is a loose connection or something similar. I am unable to get it fixed and I do not trust the repair shops here and there is no HP service center.
If anyone else had the same problem and were able to fix it please help me out. I like this laptop it has served me well in the past two years.