i found this on a forum would this be your problem
CMNetworx replied 1 year ago
Although in some scenarios resetting the bios may solve your problem.. In most cases the problem is your video card which unfortunately is integrated into the motherboard. The video card will not post (show a display) because it has failed. This seems to be a relatively common problem in the DV5000 to DV9000 range of hp laptops. I have ran into 3 identical scenarios in the same week, and one of the new motherboards did the same thing after one day. Supposedly one of the main reasons that the video cards in this particular series fail has to do with the heat from the processors heatsink passing across the video card.