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106 xSeries 343 Hardware Maintenance Manual
POST Error Beep Codes
The following tables list POST error beep codes. Prior to system video initialization, The BIOS and
BMC use these beep codes to inform users on error conditions
Table 20. BMC Generated POST Beep Codes
Code Description FRU/Action
1-5-1-1 FRB failure (processor failure) 1. Processor
2. System Board
1-5-2-1 Empty Processor 1. Processor
1-5-2-2 No Processor 1. Processor
1-5-4-2 Power fault: DC power unexpectedly lost (power control failures) 1. Power Supply
2. System Board
1-5-4-3 Chipset control failure 1. System Board
1-5-4-4 Power control failure 1. System Board
Table 21. BIOS Generated POST Error Beep Codes
Beeps Error message Description FRU/Action
1 Refresh timer failure The memory refresh circuitry on the
motherboard is faulty.
1. System Board
2 Parity error Parity cannot be reset. 1. Check DIMMs
2. System Board
3 Base memory failure Base memory test failure. 1. Check DIMMs
4 System timer System timer is not operational. 1. System Board
5 Processor failure Processor failure detected. 1. Processor
6 Keyboard controller
Gate A20 failure
The keyboard controller may be bad. The
BIOS cannot switch to protected mode.
1. Keyboard
2. System Board
7 Processor exception
interrupt error
The CPU generated an exception interrupt. 1. Processor
2. Sytem Board
8 Display memory
read/write error
The system video adapter is either missing
or its memory is faulty. This is not a fatal
error.
1. Video Adapter
2. System Board
9 ROM checksum error System BIOS ROM checksum error. 1. System Firmware
2. System Board
10 Shutdown register
error
Shutdown CMOS register read/write error
detected.
1. System Board
11 Invalid BIOS General BIOS ROM error. 1. System Firmware
2. System Board