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 ??
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.