
POST Error Messages List
If you cannot run the diagnostics program tests but did receive a POST error message, use “POST Error Messages List” to diagnose system problems. If you did not receive any error message, look for a description of your error symptoms in “Error Sympton List”.
NOTE: When you have deemed it necessary to replace an FRU, and have done so, you must run a total system check to ensure that no other activity has been affected by the change. This system check can be done through the diagnostics program.
NOTE: Check all power supply voltages, switch, and jumper settings before you replace the main board. Also check the power supply voltages if you have a “system 
NOTE: To diagnose a problem, first find the BIOS error messages in the left column. If directed to a check procedure, replace the FRU indicated in the check procedure. If no check procedure is indicated, the first Action/FRU listed in right column is the most likely cause.
| BIOS Messages | 
 | Action/FRU | |
| 
 | 
 | 
 | |
| I/O Parity Error | 1. | System board | |
| 
 | 
 | 
 | |
| CPU Clock Mismatch | 1. | Enter BIOS Setup and load the default settings. | |
| 
 | 2. | Ensure BIOS setting for processor is set | |
| 
 | 
 | correctly. | |
| 
 | 
 | 
 | |
| Real Time Clock Error | 1. | Enter BIOS Setup and load the default settings. | |
| CMOS Battery Bad | 2. RTC Battery. | ||
| CMOS Checksum Error | 3. | System Board. | |
| 
 | 
 | ||
| 
 | 
 | 
 | |
| Equipment Configuration Error | 1. | Ensure the system configuration set in BIOS | |
| 
 | 
 | Setup is correct. | |
| 
 | 2. | Enter BIOS Setup and load the default settings. | |
| 
 | 3. | RTC battery. | |
| 
 | 4. | System board. | |
| 
 | 
 | ||
| System Management Memory Bad | 1. Insert the memory modules in the DIMM sockets | ||
| Memory Error at MMMM:SSSS:OOOOh | 2. | properly, then reboot the system. | |
| 
 | Memory module. | ||
| 
 | 3. | System board. | |
| 
 | 
 | 
 | |
| RAM Parity Error | 1. | Enter BIOS Setup to disable parity check. | |
| 
 | 2. | Memory module | |
| 
 | 3. | System board | |
| 
 | 
 | ||
| PS/2 Keyboard Error or Keyboard Not | 1.  | ||
| Connected | 2. | Enter BIOS Setup and load the default settings. | |
| PS/2 Keyboard Interface Error | 3. | PS/2 keyboard | |
| PS/2 Keyboard Locked | 4. | PS/2 mouse | |
| 5. | System board | ||
| 
 | |||
| 
 | 
 | 
 | |
| Onboard xxx... Conflict(s) | 1. | Enter BIOS Setup and load the default settings. | |
| 
 | 2. | Remove all adapter cards that are NOT factory- | |
| 
 | 
 | installed, then reboot the system. | |
| 
 | 
 | 
 | |
| Floppy Disk Controller Error | 1. | Diskette drive cable/connection. | |
| Floppy Drive A Error | 2. | Diskette drive. | |
| Floppy Drive B Error | 3. | System board | |
| 
 | 
 | ||
| 
 | 
 | 
 | |
| On Board Parallel Port Conflict(s) | 1. | Enter BIOS Setup and load the default settings. | |
| On Board Serial Port 1 Conflict(s) | 2. | Remove all adapter cards that are NOT factory- | |
| On Board Serial Port 2 Conflict(s) | 
 | installed, then reboot the system. | |
| 
 | 
 | ||
| 
 | 
 | 
 | |
| Chapter 4 | 69 | 
