My computer was working fine last night until this morning when it suddenly won't respond to any type of command. I shut it off and checked all cables and connections and it still won't do anything. The computer turns on, but doesn't register the keyboard or mouse, the screen won't detect any image at all on either monitor that I've tried it on.
This will not work for everyone, but you may be lucky?
HP Notebooks and Mobile Workstations - No Power, No Boot, No Display When Power Button Is Pressed
NOTE: Be sure the battery is installed in the computer and it has sufficient power before continuing. Due to the design of the Embedded Controller/Keyboard Controller, the power supply must be disconnected and the computer must be powered with battery power to reset the Embedded Controller/Keyboard Controller.
Unplug the AC power from the computer. Press and hold the power button for more than 12 seconds. Release the power button (after at least 12 seconds). The computer will power on and should boot normally after releasing the power button. Re-connect the AC power to the computer.
NOTE: In case the battery is not charging after performing the steps to reset the Embedded Controller, unplug and re-plug in the AC power again.