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BIOS POST Beep Codes

The table below lists the POST error beep codes. Prior to system video initialization, the BIOS uses these beep codes to inform users of error conditions. The beep code occurs only when a critical error occurs or when the BIOS fails to boot to the operating system. Please note that

not all error conditions are supported by BIOS beep codes.

Number of Beeps

Description

 

 

1

Refresh failure

 

 

2

Parity cannot be reset

 

 

3

First 64 Kb memory failure

 

 

4

Timer not operational

 

 

5

Processor failure (Reserved; not used)

 

 

6

8042 GateA20 cannot be toggled (memory failure or

 

not present)

 

 

7

Exception interrupt error

 

 

8

Display memory R/W error

 

 

9

(Reserved; not used)

 

 

10

CMOS Shutdown register test error

 

 

11

Invalid BIOS (such as, POST module not found)

 

 

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Acer G520 series manual Bios Post Beep Codes, 117