Dell Precision R5500 - Page 81

Light Pattern
Problem Description Troubleshooting
Steps
Diagnostic LEDs Power Button LED
If the computer
boots, add the
peripheral cards
back one by one
until you find the
bad one.
A possible system
board failure has
occurred.
• Disconnect all
internal and
external
peripherals, and
re-start the
computer. If the
computer boots,
add the
peripheral cards
back one by one
until you find the
bad one.
• If the problem
persists, the
system board is
faulty.
A possible coin cell
battery failure has
occurred.
Remove the coin
cell battery for one
minute, reinstall the
battery, and restart.
The computer is in a
normal on condition.
The diagnostic
lights are not lit
after the computer
successfully boots
to the operating
system.
Ensure that the
display is connected
and powered on.
A possible
processor failure
has occurred.
Re-seat the
processor.
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