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Troubleshooting 81
1
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 111.
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
.