I was recently asked to service an HP notebook/laptop that refused to do anything at all on boot - absolutely nothing would display on the screen and the hard drive did not spin up. One thing did happen: the Caps Lock key light blinked.
Some research turned up the fact that HP laptops use the Caps Lock key light to indicate problems that stop the boot process. Their troubleshooting document lists the codes and their meanings, which will almost certainly help in problem solving.
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