Lenovo B520 Lenovo IdeaCentre B520 Hardware Maintenance Manual - Page 23

Beep symptoms, POST error codes - screen replacement

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Chapter 6. Symptom-to-FRU Index Beep symptoms Beep symptoms are tones or a series of tones separated by pauses (intervals without sound) during POST. The following tables describes beep symptoms. Beep Symptom 4 beeps System can not connect Memory or Memory is broken. FRU/Action Reseat the memory, or replace with known good modules. 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. • 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 CMOS Checksum Bad System can not connect fan or fan modules are broken. Description/Action 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. Reseat the fan, or replace with known good modules. 21

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Chapter 6. Symptom-to-FRU Index
21
Beep symptoms
Beep symptoms are tones or a series of tones separated by pauses
(intervals without sound) during POST.
The following tables describes beep symptoms.
Beep Symptom
FRU/Action
4 beeps System can not connect
Memory or Memory is broken.
Reseat the memory, or replace with
known good modules.
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.
•
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 Checksum Bad
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.
System can not connect
fan or fan modules are
broken.
Reseat the fan, or
replace with known good
modules.