Post Error Codes - Lenovo ThinkStation Hardware Maintenance Manual
Machine types: 4105, 4157 and 4217, 4155, 4158 and 4218
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- Hardware maintenance manual (304 pages) ,
- User manual (102 pages) ,
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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-On Self-Test, or POST. POST does the following operations.
v Checks some basic system-board operations
v Checks the memory operation
v Starts the video operation
v 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.
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Hardware Maintenance Manual
POST Error Message
CMOS battery failed
CMOS checksum error - defaults loaded
CPU at nnnn
Press Esc to skip memory test
HARD DISK INSTALL FAILURE
Keyboard error or no keyboard present
Memory Test:
Memory test fail
Description/Action
The CMOS battery is no longer functional.
Replace the battery.
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.
nnnn is the running speed of the
microprocessor.
Pressing Esc skips the full memory test
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.
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.
This message displays during a full memory
test, counting down the memory areas being
tested.
If POST detects an error during memory
testing, additional information appears. This
information gives specifics about the type
and location of the memory error.
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