POST error codes

Each time you power-on the system, it performs a series of tests that check the operation of the system and some options. This series of tests is called the Power-OnSelf-Test, or POST. POST does the following operations.

•Checks some basic system-board operations

•Checks the memory operation

•Starts the video operation

•Verifies that the boot drive is working

If the POST detects a problem, an error message appears on the screen. A single problem can cause several error messages to appear. When you correct the cause of the first error message, the other error messages probably will not appear on the screen the next time you turn on the system.

POST Error Message

Description/Action

 

 

CMOS battery failed

The CMOS battery is no longer functional.

 

Replace the battery.

 

 

CMOS checksum error - defaults loaded

Checksum of CMOS is incorrect.

 

The computer loads the default configuration settings.

 

This error might indicate that CMOS has become corrupt

 

due to a weak CMOS battery.

 

 

CPU at nnnn

nnnn is the running speed of the microprocessor.

 

 

Press Esc to skip memory test

Pressing Esc skips the full memory test

 

 

HARD DISK INSTALL FAILURE

Cannot find or initialize the hard disk drive controller or

 

the drive.

 

Make sure the hard disk drive is correctly installed.

 

If no hard disk drives are installed, make sure the hard

 

disk drive selection in Setup is set to NONE.

 

 

Keyboard error or no keyboard present

Cannot initialize the keyboard.

 

Make sure the keyboard is properly connected to the

 

computer and that no keys are held pressed during POST.

 

To purposely configure the computer without a keyboard,

 

set the error halt condition in Setup to HALT ON ALL, BUT

 

KEYBOARD. The BIOS then ignores the missing keyboard

 

during POST.

 

 

Memory Test:

This message displays during a full memory test, counting

 

down the memory areas being tested.

 

 

Memory test fail

If POST detects an error during memory testing, additional

 

information appears. This information gives specifics

 

about the type and location of the memory error.

 

 

68ThinkCentre Hardware Maintenance Manual

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Lenovo 4466, 4471, 4498, 4480, 4485, 4474 Post error codes, Post Error Message Description/Action, Hard Disk Install Failure
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