Why won't my HP dv4-2170us laptop turn on?

When I attach my laptop, an HP d4-4 2170us, to a power source, whether its a half-charged battery (which I know has power in it from its power meter) or a wall outlet without a battery, and press the power button, all that happens is that the white power indicator light next to the power button flashes once, as if about to turn on. If the laptop was plugged into a wall, the charging indicator light on the side of the laptop turns off after the power light flashes once. Further presses of the power button do nothing. After disconnecting the power source, reconnecting it, and then pressing the power button, the single flash of the power indicator light appears once again. If I re-connect to the wall and disconnect the battery, the charging indicator light goes out once again after I press the power button and see the power indicator light flash. Neither the fan nor the BIOS, nor any sort of beeping sound come on. What is wrong with my laptop and how do I fix it?

For reference, here is a link to 2 videos of the problem: https/www.dropbox.com/sc/q6tm8mh72512wc6/cOSMD5FchX

If anything seems a little vague, please watch the second video as it is very explicit. ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

Below is some info from the manual:

Battery Light Status [this is the light on the side of the laptop]:

On: The battery is charging.

Flashing: The battery reaches a low battery level or a critical battery level.

Off: If the computer is connected to an external power source, the light is off when all batteries in the computer are fully charged. If the computer is not connected to an external power source, the light is off until the battery reaches a low battery level.

Power Light Status [this is the light next to the power button]:

On: The computer is on.

Flashing: The computer is in Sleep.

Off: The computer is off or in Hibernation.