Dell Precision T1600 (Early 2011) - Manual (Page 65)

19
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
computer turns
on properly.
65