Acer Altos G530 Series - Manual (Page 151)

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POST beep codes
The following table lists the error beep codes. Prior to system video
initialization, 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. Not all error
conditions are supported by the BIOS beep codes.
Number of
beeps
Description
1 Memory refresh timer error
2 Parity error in base memory (first 64KB block)
3 Base memory read/write test error
4 Timer not operational
5 Processor failure
6 8042 GateA20 cannot be toggled (memory failure or not
present)
7 Exception interrupt error
8 Display memory R/W error
9 ROM checksum error
10 CMOS shutdown register test error
11 Cache memory test failed