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CX400 (Juneau motherboard) - POST Errors

Recoverable POST errors

Whenever a recoverable (non-terminal) error occurs during POST, the BIOS displays an error message describing the problem (the most usual are described below). After some messages, you may be prompted to Press <F1> key to resume, <F2> to run Setup or just Press <F2> key if you want to run Setup.

In general, you should respond to these errors as follows:

  • Shut down the computer, wait 20 to 30 seconds, and then turn it on again to see if the problem is still reported.
  • Check that all external cables are securely connected.
  • Try running the BIOS Setup utility to reconfigure the system. If the computer won’t start after you make changes in BIOS Setup, try restoring the original values.
  • Open up the system unit and check that all internal signal and power cables are securely connected.
  • If the problem persists, contact your supplier or authorised maintainer.
Error Message Explanation
Diskette drive A error Drive A is present but fails the POST diskette tests. Check that the drive is defined with the proper diskette type in Setup and that the diskette drive is installed correctly.
Extended RAM Failed at offset: nnnn* Extended memory not working or not configured properly at offset nnnn*.
Failing Bits: nnnn* nnnn* is a map of the bits at the RAM address (System, Extended, or Shadow memory) that failed the memory test. Each 1 in the map indicates a failed bit.
Fixed Disk 0 Failure or Fixed Disk 1 Failure or Fixed Disk Controller Failure Fixed disk is not working or not configured properly. Check to see if fixed disk is installed properly. Run Setup to be sure the fixed-disk type is correctly identified.
Incorrect Drive A type - run SETUP Type of diskette drive for drive A not correctly identified in Setup.
Invalid NVRAM media type Problem with NVRAM (CMOS) access.
Keyboard controller error The keyboard controller failed test. Try replacing the keyboard.
Keyboard error Keyboard not working.
Keyboard error nn BIOS discovered a stuck key and displayed the scan code nn for the stuck key.
Keyboard locked - Unlock key switch Unlock the system to proceed.
Monitor type does not match CMOS - Run SETUP Monitor type not correctly identified in Setup.
Operating system not found Operating system cannot be located on either drive A or drive C. Enter Setup and see if fixed disk and drive A are properly identified.
Parity Check 1 Parity error found in the system bus. BIOS attempts to locate the address and display it on the screen. If it cannot locate the address, it displays ????.
Parity Check 2 Parity error found in the I/O bus. BIOS attempts to locate the address and display it on the screen. If it cannot locate the address, it displays ????.
Press <F1> to resume, <F2> to Setup Displayed after any recoverable error message. Press <F1> to start the boot process or <F2> to enter Setup and change any settings.
Real time clock error Real-time clock fails BIOS test. May require motherboard repair.
Shadow RAM Failed at offset: nnnn* Shadow RAM failed at offset nnnn* of the 64 KB block at which the error was detected.
System battery is dead - Replace and run SETUP The CMOS clock battery indicator shows the battery is dead. Replace the battery and run Setup to reconfigure the system.
System cache error - Cache disabled RAM cache failed the BIOS test. BIOS disabled the cache.
System CMOS checksum bad - run SETUP System CMOS RAM has been corrupted or modified incorrectly, perhaps by an application program that changes data stored in CMOS. Run Setup and reconfigure the system either by getting the default values and/or making your own selections.
System RAM Failed at offset: nnnn* System RAM failed at offset nnnn* of the 64 KB block at which the error was detected.
System timer error The timer test failed. Requires repair of system motherboard.

*nnnn = hexadecimal number

 

Terminal POST errors and beep codes

There are several POST routines that shut down the computer if they fail. The BIOS sounds a sequence of beeps to identify the point at which POST failed. The most usual errors are listed below.

The BIOS also issues one long tone followed by two short tones if the video system is faulty or if an external ROM module (including video ROM) fails.

Turn off the computer for 30 seconds and then try again. If the fault persists, make a note of the error code (if any) and call your supplier or authorised maintainer.

Beeps Port 80h Code Explanation
1-2-2-3 16h BIOS ROM checksum
1-3-1-1 20h Test DRAM refresh
1-3-1-3 22h Test Keyboard Controller
1-3-3-1 28h Autosize DRAM
1-3-3-2 29h Initialize POST Memory Manager
1-3-3-3 2Ah Clear 512 KB base RAM
1-3-4-1 2Ch RAM failure on address line xxxx
1-3-4-3 2Eh RAM failure on data bits xxxx of low byte of memory bus
1-4-1-1 30h RAM failure on data bits xxxx of high byte of memory bus
2-1-2-2 45h POST device initialization
2-1-2-3 46h Check ROM copyright notice
2-2-3-1 58h Test for unexpected interrupts
2-2-4-1 5Ch Test RAM between 512 and 640 KB
1-2 98h Search for option ROMs. One long, two short beeps on checksum failure
1-2-2-3 16h BIOS ROM checksum
1-3-1-1 20h Test DRAM refresh
1-3-1-3 22h Test Keyboard Controller
1-3-3-1 28h Autosize DRAM
1-3-3-2 29h Initialize POST Memory Manager
1-3-3-3 2Ah Clear 512 KB base RAM
1-3-4-1 2Ch RAM failure on address line xxxx
1-3-4-3 2Eh RAM failure on data bits xxxx of low byte of memory bus
1-4-1-1 30h RAM failure on data bits xxxx of high byte of memory bus
2-1-2-2 45h POST device initialization
2-1-2-3 46h Check ROM copyright notice
2-2-3-1 58h Test for unexpected interrupts
2-2-4-1 5Ch Test RAM between 512 and 640 KB
1-2 98h Search for option ROMs. One long, two short beeps on checksum failure

 

 

Computing for a Connected World