Lenovo IdeaCentre B520 Manual de usuario descargar pdf (Pagina 23)

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 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

• Veries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.

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Lenovo IdeaCentre B520 Manual de usuario Pagina 23