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HP Notebook PCs - Recovering the BIOS (Basic Input Output System)

The BIOS is the first software to run after turning on the computer. If the BIOS on your computer becomes corrupted, the computer fails to boot to Windows.

The BIOS can be corrupted during normal operation, through environmental conditions (such as a power surge or outage), from a failed BIOS upgrade, or damage from a virus. If the BIOS is corrupted, the system automatically attempts to restore the BIOS from a hidden partition when the computer is restarted. This document covers other steps to restore the BIOS if the automatic BIOS restoration does not work.

If you experience any of the following symptoms after restarting the computer, recover the BIOS.

  • Windows does not start and the caps lock or num lock keys blink, or the computer beeps 2 times

  • Power light or charging light continues to blink

  • A BIOS APPLICATION ERROR 501 message displays

  • The computer stops at a black or blank screen when powered on

  • The computer turns on and you might hear the internal fan, but the display is blank and Windows does not start

Note:

For business computers, your IT department or local IT service might manage BIOS settings. Confirm this if you cannot access BIOS settings or restore the BIOS.

Reset the Embedded Controller

In some cases, the computer cannot boot to Windows because the data in the Embedded Controller (EC) is corrupted. Use this procedure to reset the EC.

  1. Turn off the computer and disconnect the power cord.

  2. Press and hold the power button for 11 seconds.

The computer turns on and the EC is reset.

If this does not recover your computer, see Reset the CMOS.

Reset the CMOS

In some cases, the automatic BIOS recovery fails because the Complementary Metal Oxide Semiconductor (CMOS) data is corrupted. The CMOS stores BIOS settings. Use this procedure to reset the CMOS and recover the BIOS.

  1. Turn off the computer.

  2. Press and hold the Windows + V keys, and then simultaneously press and hold the power button. After 2 to 3 seconds, continue to press and hold the Windows + V keys, but release the power button.

  3. When the CMOS Reset screen displays or you hear beeping sounds, release the Windows + V keys.

    At the completion of a successful CMOS Reset, a message similar to the following one is displayed.

    Successful CMOS reset button message
  4. Press enter to restart the computer.

    If this does not recover your computer, see Recover the BIOS.

Recover the BIOS

If your computer BIOS still does not reset, you can try to recover the BIOS using a key press combination or a USB recovery drive.


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