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Chapter 2 73
Troubleshooting
Using the System Board LEDs for Troubleshooting
FANS OFF or
blink
sequence 4,
5 or 6
If the following solutions do not bring the LED back on
or cause it to properly blink, replace the system board.
OFF Unplug the system and replace the
system board
Blink Sequence 4 Unplug the system and operate the
unit when its environment gets
cooler
Blink Sequence 5 Replace the fan associated with the
message in your system LCD. If
power supply fans are bad, you have
to replace the power supply. If the
PCI fan is bad, replace it. If either
one of the processor fans are bad, you
must replace the system board. Note,
fans may still be spinning, but their
control signal may have failed.
Blink Sequence 6 Check that the 24-pin power supply
signal cable is properly connected
Press the power button off and
unplug the system and wait for two
minutes before turning the system
back on
SHORT ON If the following solutions do not turn this LED off,
replace the system board.
• Check that no pieces of metal are shorting
connections anywhere in the system
• Check that no pins on system connectors are bent
and touching each other
1. The LEDs are in the OFF state, or in the case of the FANS LED, the LED is
blinking sequence 1, 2, or 6 or it is not blinking.
Table 2-4. Solutions for the Non-Default LED States
LED Name
1
Non-Default
State
Solution