Troubleshooting Tools; Diagnostic Lights; Diagnostic Light Codes During Post - Dell Precision M2400 Service Manual

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Troubleshooting
Dell™ Latitude™ E6400 and E6400 ATG and
Mobile Workstation Precision™ M2400 Service Manual
Troubleshooting Tools
Solving Problems
Dell Technical Update Service
Dell Support Utility
Troubleshooting Tools

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
Light Problem Description
Pattern
No memory modules are
detected.
Memory modules are
detected, but a memory
failure has occurred.
Memory failed to initialize or
memory is unsupported.
System board failure has
occurred.
A possible processor failure
has occurred.
A possible graphics
card/video failure has
occurred.
A possible LCD failure has
occurred.
System failed on hard drive
initialization.
Suggested Resolution
If two or more memory modules are installed, remove the modules (see
l
then reinstall one module (see
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).
l
If the problem persists, contact Dell Support.
l
If two or more memory modules are installed, remove the modules (see
l
then reinstall one module (see
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).
l
If the problem persists, contact Dell Support.
l
If two or more memory modules are installed, remove the modules (see
l
then reinstall one module (see
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).
l
If the problem persists, contact Dell Support.
l
Contact Dell Support.
l
Reseat the processor (see
l
If the problem persists, contact Dell Support.
l
Reseat any installed graphics cards.
l
If available, install a working graphics card into your computer.
l
If the problem persists, contact Dell Support.
l
Reseat the LCD cable (see
l
If the problem persists, contact Dell Support.
l
Reseat the hard drive (see
l
If the problem persists, contact Dell Support.
l
, Off , or Flashing
Replacing a Memory Module) and restart the computer. If the computer
Replacing a Memory Module) and restart the computer. If the computer
Replacing a Memory Module) and restart the computer. If the computer
Processor Module).
Display Assembly).
Hard Drive).
.
Removing a Memory Module),
Removing a Memory Module),
Removing a Memory Module),