If your laptop used to freeze up at random, the mouse and keyboard did not respond at some times or you experienced longer and longer boot times with the HP logo on, then your laptop is suffering from a motherboard failure. The options are either to get a new motherboard, or repair the one you have. Here's a
great repair tutorial for non booting or random freezeup HP nx6110. The repair does not require any tools, except for a Torx screwdriver, and it usually takes about an hour to do the fix. If that doesn't work then you'll have to use a hot air gun and do a reflow of the FSB chip.
What happened is that in time, the FSB controller chip lost contact with the motherboard and since the FSB controls the hard drive, dvd, keyboard, mouse and so on, the laptop cannot boot. The repair tutorial will help you to re-establish contact between the chip and the motherboard, but you will have to open up the laptop. It's not a difficult repair, but if you're not very handy with tools, you may take the laptop and the tutorial to someone that can do the work for you. It's better to be safe than sorry.
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