Beep Codes
Page(s) - Printed From
( Example beeps of my own O/S )

  • Beep codes are used by the BIOS (Basic Input and Output System) to indicate a serious or fatal error to the end user.
  • Beep codes are used when an error occurs before the system video has been initialized.
  • Beep codes will be generated by the system board speaker, commonly referred to as the "PC speaker."
  • Please note that not all Bios Manufacturers or Systems Designers use the same Beep Codes.

Number of Beeps Description

  •   1 beep        Memory refresh timer error.
  •   2 beeps       Parity error
  •   3 beeps       Main memory read / write test error.
  •   4 beeps       Motherboard timer not operational
  •   5 beeps       Processor error
  •   6 beeps       Keyboard controller BAT test error.
  •   7 beeps       General exception error.
  •   8 beeps       Display memory error.
  •   9 beeps       ROM checksum error
  • 10 beeps       CMOS shutdown register read/write error
  • 11 beeps       Cache memory bad

Troubleshooting BIOS Beep Codes

Troubleshooting Action

  • 1, 2 or 3 beeps      Reseat the memory, or replace with known good modules.

  • 4-7 or  9-11 beeps    Fatal error indicating a serious problem with the system. Consult your system manufacturer. Before declaring the motherboard beyond all hope, eliminate the possibility of interference by a malfunctioning add-in (expansion) card. Remove all expansion cards, except the video adapter.

    If the beep codes are generated even when all other expansion cards are absent, the motherboard has a serious problem. Consult your system manufacturer.

    If the beep codes are not generated when all other expansion cards are absent, one of the add-in cards may be causing the malfunction. Insert the cards back into the system one at a time until the problem happens again. This will reveal the malfunctioning add-in card.

  • beeps     If the system video adapter is an add-in card, replace or reseat the video adapter or move the card to another slot on the system board . If the video adapter is an integrated part of the system board, the board may be faulty.