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This page gives an overview over numerical error codes and beep codes generated by the BIOS.

==Numerical Error Codes==
IBM provides [http://www-3.ibm.com/pc/support/site.wss/document.do?lndocid=LWIK-3SR4PW a detailed listing of numerical BIOS error codes] including information on fixes.

==Beep Codes==
{| cellspacing=0 cellpadding=3 border=1 style="vertical-align:top;"
!Beep signal !! Additional indicators !! Meaning
|-
| continuous beep || ||
*System board failure
|-
| one beep || unreadable, blank or flashing LCD ||
*LCD connector problem
*LCD backlight inverter failure
*video adapter faulty
*LCD assembly faulty
*System board failure
*power supply failure
|-
| one beep || Message "Unable to access boot source" ||
*Boot device failure; system board failure
|-
| one long, two short beeps || ||
*System board failure
*Video adapter problem
*LCD assembly failure
|-
| one beep, three short beeps<br>three short beeps, one beep || ||
*Memory problem: bad DIMM or bad DIMM slot
|-
| one long, four short beeps || ||
*Low battery voltage
|-
| one beep every second || ||
*Low battery voltage
|-
| two short beeps || error codes ||
*POST error message
|-
| two short beeps || ||
*System board failure
|}

== External Links ==


[http://www.comptechdoc.org/hardware/beepcodes/ Complete list of beep codes for all major BIOS's]