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5 Power-On Self-Test and Error Messages
Beep Codes
Beep Codes
If a terminal error occurs during POST, the system issues a beep code before
attempting to display the error in the upper left corner of the screen. Beep
codes are useful for identifying the error when the system is unable to
display the error message.
1.
If the BIOS detects error 2C or 2E (base 512K RAM error), it displays
an additional word-bitmap (xxxx) indicating the address line or bits that
failed. For example, “2C 0002” means address line 1 (bit one set) has
failed. “2E 1020” means data bits 12 and 5 (bits 12 and 5 set) have failed
in the lower 16 bits.
Beep Pattern
Beep
Code
Numeric
Code
Description
— - - - - - - - 1-2-2-3 16h BIOS ROM check-sum failure
— - - - — — 1-3-1-1 20h DRAM refresh test failure
— - - - — - - - 1-3-1-3 22h 8742 Keyboard controller test failure
— - - - - - - - — 1-3-4-1 2Ch RAM failure on address line xxxx
1
—
- - - - - - - - - - 1-3-4-3 2Eh RAM failure on data bits xxxx
1
of low byte of memory bus
- - — - - - - - 2-1-2-3 46h ROM copyright notice check failure
- - - - - - - — 2-2-3-1 58h Unexpected interrupts test failure
— - - 1-2 98h Video configuration failure or option ROMs check-sum
failure
- - - - - - - - - - - - - - 4-4-2-4 F7 Crisis Recovery Failure
- 1 B4h This does not indicate an error. There is one short beep
before system startup.