Acer Altos G520 series - Manual (Page 127)

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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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