Dell Precision T1600 (Early 2011) - Manual (Page 70)

Light Pattern
Problem Description Troubleshooting
Steps
Diagnostic LEDs Power Button LED
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.
Memory modules
are detected, but a
memory failure has
occurred.
• If two or more
memory
modules are
installed,
remove the
modules (see
your service
manual), then
re-install one
module (see
your service
manual) and re-
start the
computer. If the
computer starts
normally,
continue to
install additional
memory
modules (one at
a time) until you
have identified a
faulty module or
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