Fujitsu LifeBook N6420 User Manual download pdf (Page 69)

Troubleshooting

An error message is

displayed on the screen

during the notebook

(boot) sequence.

Power On Self Test (POST) has

detected a problem.

See the POST messages to determine the meaning

and severity of the problem. Not all messages are

errors; some are status indicators. (See Power On Self

Test Messages page 63 for more information)

Your notebook appears to

change setup parameters

when you start it.

BIOS setup changes were not

saved when you exited the

BIOS setup utility, returning it

to previous settings.

Make sure you select Save Changes And Exit when

exiting the BIOS setup utility.

The BIOS CMOS hold-up

battery has failed.

Contact your support representative for repairs.

This is not a user serviceable part but has a normal

life of 3 to 5 years.

Video Problems

The display is blank when

you turn on your notebook.

Something is pushing on the

Closed Cover switch.

Clear the Closed Cover switch. (See Figure on page 8

for location)

The display angle and bright-

ness settings are not adequate

for your lighting conditions.

Press the [Fn] + [F7] keys repeatedly until you have

the desired brightness.

The LifeBook notebook is set

for an external video device

only.

Pressing [F10] while holding down the [Fn] key

allows you to change your selection of where to

send your display video. Each time you press the

combination of keys you will step to the next choice.

The choices, in order are: built-in display only,

external monitor only, both built-in display and

external monitor.

The power management time-

outs may be set for very short

intervals and you failed to

notice the display come on

and go off again.

Press any button or key on the keyboard, or move

the mouse to restore operation. If that fails, push the

Power and Suspend/Resume button. (The display

may be shut off by Standby mode, Auto Suspend or

Video Timeout.)

The notebook turned on

with a series of beeps and

your display is blank.

Power On Self Test (POST)

has detected a failure which

does not allow the display

to operate.

Contact your support representative.

Your system display won’t

turn on when the system is

turned on or when the

system has resumed.

The system may be password-

protected.

Check the status indicator panel to verify that the

Security icon is blinking. If it is blinking, enter your

password.

The display goes blank by

itself after it is used.

Something is pushing on the

Closed Cover switch.

Check the Closed Cover switch. (See Figure on page

8 for location)

The notebook has gone into

Video timeout, Standby mode,

Suspend mode or Save-to-Disk

mode because you have not

used it for a period of time.

Press any button or key on the keyboard, or move the

mouse to restore operation. If that fails, push the

power/suspend/resume button. Check your power

management settings, or close all applications and go

to Power Savings in the setup utility to adjust the

timeout values to suit your operation needs. (See

BIOS Setup Utility page 29 for more information)

Problem Possible Cause Possible Solutions

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Fujitsu LifeBook N6420 User Manual Page 69

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