Dell Precision R5500 (Early 2011) - Manual (Page 75)

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Troubleshooting
Diagnostic LEDs
NOTE: The diagnostic LEDs only serve as an indicator of the progress through the POST process. These LEDs do
not indicate the problem that caused the POST routine to stop.
The diagnostic LEDs are located on the front of the chassis next to the power button. These diagnostic LEDs are only
active and visible during the POST process. Once the operating system starts to load, they turn off and are no longer
visible.
The system now includes pre-POST and POST LEDs in an attempt to help pinpointing a possible problem with the system
easier and more accurate.
NOTE: The diagnostic lights will blink when the power button is amber or off, and will not blink when it is blue. This
has no other significance.
Light Pattern Problem Description Troubleshooting Steps
Diagnostic LEDs Power Button LED
The computer is either
turned off or is not receiving
power.
• Re-seat the power
cable in the power
connector at the
back of the
computer and the
electrical outlet.
• Bypass power
strips, power
extension cables,
and other power
protection devices
to verify that the
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