Dell Precision R5500 (Early 2011) - Manual (Page 78)

Light Pattern Problem Description Troubleshooting Steps
Diagnostic LEDs Power Button LED
A possible system board
failure has occurred. Remove all peripheral cards
from the PCI and PCI-E slots
and re-start the computer. If
the computer boots, add the
peripheral cards back one
by one until you find the bad
one.
Power connector not
installed properly. Re-seat the 2x2 power
connector from the power
supply unit.
Possible peripheral card or
system board failure has
occurred. Remove all peripheral cards
from the PCI and PCI-E slots
and re-start the computer. 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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