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1 troubleshooting, 1 troubleshooting tools, 1 diagnostic lights – Dell Latitude E6400 XFR (Mid 2008) User Manual

Page 7: Troubleshooting, Roubleshooting, Ools, Diagnostic lights

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Dell

Latitude™ E6400 XFR Service Manual

Page 7

1 Troubleshooting

1.1 Troubleshooting Tools

1.1.1

Diagnostic Lights

CAUTION:

Before you begin any of the procedures in this section, follow the safety

instructions that shipped with your computer.

Your computer has three keyboard status lights located above the keyboard. During normal operation, the keyboard

status lights display the current status (on or off) of the Num Lock, Caps Lock, and Scroll Lock features. If the
computer starts without error, the lights flash, and then turn off. If the computer malfunctions, however, you can use

the status of the lights to help identify the problem.

NOTE:

After the computer completes POST, the Num Lock light may remain on, depending on

your BIOS settings. For more information on using the system setup program, see the Dell™

Technology Guide on your computer or at support.dell.com.

Diagnostic Light Codes During POST

To troubleshoot a problem with your computer, read the sequence of the keyboard status lights in order from left to
right (Num Lock, Caps Lock, and then Scroll Lock). If the computer malfunctions, the individual lights display a status
of either On ,

Off

, or Flashing

.

Light Pattern

Problem Description

Suggested Resolution

No memory Modules are
detected

If two or more memory modules are installed,
remove the modules (see Removing a Memory

Module), then reinstall one module (see Replacing a

Memory Module) and restart the computer. If the
computer starts normally, continue to install

additional memory modules (one at a time) until you

have identified a faulty module or reinstalled all
modules without error.

If available, install working memory of the same

type into your computer (see Memory).

If the problem persists, contact Dell Support.

Memory modules are

detected, but a memory
failure has occurred.

If two or more memory modules are installed,

remove the modules (see Removing a Memory
Module), then rei
nstall one module (see Replacing a

Memory Module) and restart the computer. If the

computer starts normally continue to install
additional memory modules (one at a time) until you

have identified a faulty module or reinstalled all

modules without error.

If available, install working memory of the same
type into your computer (see Memory).

If the problem persists, contact Dell Support.

Memory failed to initialize

or memory is unsupported.

If two or more memory modules are installed,

remove the modules (see Removing a Memory

Module), then reinstall one module (see Replacing a
Memory Module) and restart the computer. If the

computer starts normally, continue to install

additional memory modules (one at a time) until you

have identified a faulty module or reinstalled all
modules without error.

If available, install working memory of the same

type into your computer (see Memory).
If the problem persists, contact Dell Support.