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26 About Your System
Diagnostic Lights (Optional)
The four diagnostic indicator lights on the system front panel display error
codes during system startup. Table 1-5 lists the causes and possible corrective
actions associated with these codes. A highlighted circle indicates the light is
on; a non-highlighted circle indicates the light is off.
NOTE: The diagnostic LEDs are not present when the system is equipped with an
LCD display.
Table 1-1. Diagnostic Indicator Code
Code Causes Corrective Action
The system is in a normal
off condition or a possible
pre-BIOS failure has
occurred.
The diagnostic lights are
not lit after the system
successfully boots to the
operating system.
Plug the system into a working
electrical outlet and press the
power button.
The system is in a normal
operating condition after
POST.
Information only.
BIOS checksum failure
detected; system is in
recovery mode.
See "Getting Help" on page 185.
Possible processor failure. See "Troubleshooting the
Processors" on page 171.
Memory failure. See "Troubleshooting System
Memory" on page 162.
Possible expansion card
failure.
See "Troubleshooting Expansion
Cards" on page 169.
Possible video failure. See "Getting Help" on page 185.
book.book Page 26 Tuesday, June 9, 2009 4:09 PM