Dell E6400 ATG manual Troubleshooting Tools

Back to Contents Page

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 , Off , or Flashing .

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