About Your System 21
Diagnostic Lights (Optional)The four diagnostic indicator lights on the system front panel display error
codes during system startup. Table1-1 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 Codes (Optional)
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 page167.
Possible processor failure. See "Troubleshooting the
Microprocessors" on page160.
Memory failure. See "Troubleshooting System
Memory" on page152.
Possible expansion card
failure.
See "Troubleshooting Expansion
Cards" on page159.
Possible video failure. See "Getting Help" on page167.
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