This document pertains to all HP notebook PCs except certain Notebooks with Sure Start architecture.
If the BIOS on your notebook becomes corrupted, such as from a failed BIOS upgrade or damage from a virus, the computer might show any the following symptoms:
The computer displays the error message BIOS APPLICATION ERROR 501.
The computer stops at a black or blank screen and it will not enter any of the Boot Options, such as: the BIOS Setup Utility, Hardware Diagnostic Tools, System Recovery screens, etc.
The computer does not boot and the Caps Lock or Num Lock LED blinks twice or the computer emits beep codes.
The computer turns on, for example: the fan might spin, but there is no video on the internal display or external monitor and it does not boot into the operating system.
If the computer shows any of the previous symptoms and it does not boot up, use this document to restore the BIOS.
Many HP notebook computers have an HP BIOS Restore tool that might be able to recover the BIOS from an earlier version and restore basic functionality. This tool might or might not work in the event of BIOS corruption depending on many factors, but it is worth trying in the event the BIOS has become corrupted.