HI , HAVE A HP DV9700 . When trying to start it can hear the Laptop going through the motions but the screen only shows very five coloured vertical lines to 1 side of the page ?? Would / Could that mean the graphics card to gone ??
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It could be a number of things, but there does seem to be a problem with the HP 9700 series laptops and the motherboard/video card going bad resulting in a boot that displays a few lines on the screen. I suggest you contact HP and check the HP forums about this issue.
Agree, go to the HP service center and check your laptop there, they should help you. Still on warranty? If yes then claim it...