My friend had a similar problem, he watched a movie with the PC put the comforter on his graphics card has overheated. He had the same problem, and even he cannot see anything on the screen. Then after showing that to service center of HP, he was told to change the graphics card and had to spent some money on that. I think that you should also check your card. He was having following specification :
Processor: Intel Core 2 Duo 1.67 MHz
RAM installed: 2046 MB SDRAM
Graphics: NVIDIA GeForce GS 8400M
Battery Technology: Lead Acid
OS provided: Windows Vista Home Premium
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