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Celeron™ Processor Development Kit Manual
5-15
BIOS Quick Reference
5.12 Embedded BIOS Beep Codes
Embedded BIOS tests much of the system hardware early in POST before messages can be
displayed on the screen. When system failures are encountered at these early stages, POST uses
beep codes (a sequence of tones on the speaker) to identify the source of the error.
The following is a comprehensive list of POST beep codes for the system BIOS. BIOS extensions,
such as VGA ROMs and SCSI adapter ROMs, may use their own beep codes, including short/long
sequences, or possibly beep codes that sound like the ones below. When diagnosing a system
failure, remove these adapters if possible before making a final determination of the actual POST
test that failed.
Mnemonic Code Beep CountDescription of Problem
POST_BEEP_REFRESH 1 Memory refresh is not working.
POST_BEEP_PARITY 2 Parity error found in 1st 64KB of memory.
POST_BEEP_BASE64KB 3 Memory test of 1st 64KB failed.
POST_BEEP_TIMER 4 T1 timer test failed.
POST_BEEP_CPU 5 CPU test failed.
POST_BEEP_GATEA20 6 Gate A20 test failed.
POST_BEEP_DMA 7 DMA page/base register test failed.
POST_BEEP_VIDEO 8 Video controller test failed.
POST_BEEP_KEYBOARD 9 Keyboard test failed.
POST_BEEP_SHUTDOWN 10 CMOS shutdown register test failed.
POST_BEEP_CACHE 11 External cache test failed.
POST_BEEP_BOARD 12 General board initialization failed.
POST_BEEP_LOWMEM 13 Exhaustive low memory test failed.
POST_BEEP_EXTMEM 14 Exhaustive extended memory test failed.
POST_BEEP_CMOS 15 CMOS restart byte test failed.
POST_BEEP_ADDRESS_LINE 16 Address line test failed.
POST_BEEP_DATA_LINE 17 Data line test failed.
POST_BEEP_INTERRUPT 18 Interrupt controller test failed.
POST_BEEP_PASSWORD 1 Incorrect password used to access SETUP.