Chapter 4
72
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.
BIOS Recovery Beep Codes
An error or warning condition at boot can result in a series of beeps being issued known as "beep
codes.” These beeps have a code that identifies system or PCI card events. For example, some Acer RAID
cards have beep codes. Before checking for a system beep code error make sure the PCI card is not causing
the beeping.
<CTRL_N> Pressed
CMOS is ignored and NVRAM is cleared. User must enter Setup
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
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)
Beeps
Reason
1
One long beep - video is active.
1-2
One long beep and two short beeps: Insert the BIOS recovery
diskette.
Error Message
Explanation
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