A hard or forced reset erases all information in the computer's memory which may restore functionality. Resetting your computer forces the system to clear and reestablish the software connections between the BIOS and the hardware.
Performing a hard or forced reset may fix the following conditions:
Windows stops responding
Computer stops before Windows loads (no boot, blinking cursor on a black display, or errors relating to OS not found or missing drive)
Display suddenly goes blank and stays blank
Keyboard stops responding
The computer does not return from sleep or suspend mode
An external device stops responding (turn off power to the device in addition to performing the steps in this document)
When performing a hard reset, you must disconnect or remove all peripheral devices. You should start and test the computer by itself, and then reconnect one peripheral device at a time. To resolve the start up or operational problem, you should run the HP Support Assistant, or manually install all updated drivers from Microsoft and HP.
To perform a hard reset, use the following steps:
Turn off the computer.
Remove the computer from any port replicator or docking station.
Disconnect all external connected devices: USB storage devices, external displays, printers, etc.