Diagnostic Light Codes During Post; Troubleshooting Tools; Diagnostic Lights - Dell Precision M6400 Service Manual

Troubleshooting: Dell Precision M6400 Service Manual
Back to Contents Page
Troubleshooting
Dell Precision™ M6400 Service Manual

Troubleshooting Tools

Solving Problems
Dell Technical Update Service
Troubleshooting Tools

Diagnostic Lights

CAUTION: Before working inside your computer, read the safety information that shipped with your
computer. For additional safety best practices information, see the Regulatory Compliance Homepage on
www.dell.com at: www.dell.com/regulatory_compliance.
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 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 Problem
Pattern Description
No memory
modules are
detected.
Memory
modules are
detected, but a
memory failure
has occurred.
Memory failed
to initialize or
file:///T|/htdocs/systems/wsm6400/en/sm/trouble.htm[11/16/2012 10:26:15 AM]
.
Suggested Resolution
If two or more memory modules are installed, remove the modules (see
Memory Module), then reinstall one module (see
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.
If two or more memory modules are installed, remove the modules (see
Memory Module), then reinstall one module (see
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.
If two or more memory modules are installed, remove the modules (see
Memory Module), then reinstall one module (see
Removing a
Replacing a Memory Module) and
Removing a
Replacing a Memory Module) and
Removing a
Replacing a Memory Module) and