All HP (Hewlett-Packard) laptop computers have a provided power adaptor and fuse box. This equipment makes sure the electrical socket directs the correct amount of power toward the computer. If the HP power adaptor fuse is damaged, the computer is not going to receive power and the laptop is not going to turn on (once you deplete the battery supply). If this occurs, you need to try and reset the power adaptor or replace the fuse to correct the power flow problem.
Disconnect the power cable from the HP computer system and turn off the computer.
Remove the power cable from the electrical socket and wait for at least 30 seconds. Connect the power cable back to the laptop and the electrical socket, then turn the computer on. This resets the power on the adaptor fuse and directs the electricity to the HP equipment.
Check the voltage amount used by the HP power adaptor. This is printed on the underside of the adaptor fuse. If the HP still does not receive power, it is because the adaptor fuse is completely fried. You need to purchase a replacement adaptor with the same voltage in order to begin using the laptop again.