Troubleshooting; Diagnostic Lights; Diagnostic Light Codes During Post - Dell Latitude UY691 User Manual

Troubleshooting

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 "System Setup Program" on page 93.

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 Pattern Problem Description
No memory modules
are detected.
, Off , or Flashing
Suggested Resolution
• If two or more memory modules are
installed, remove the modules, then
reinstall one 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 (see "Memory"
on page 115).
• If available, install working memory of
the same type into your computer (see
"Memory" on page 115).
• If the problem persists, contact Dell
Support.
.
Troubleshooting
71