D–30 361288-003 Service Reference Guide, dc7100
POST Diagnostic Front Panel LEDs and Audible Codes
This section covers the front panel LED codes as well as the audible codes that may occur before
or during POST that do not necessarily have an error code or text message associated with them.
✎
If you see flashing LEDs on a PS/2 keyboard look for flashing LEDs on the front panel of the
computer and refer to the following table to determine the front panel LED codes.
✎
Recommended actions in the following table are listed in the order in which they should be
performed.
Diagnostic Front Panel LEDs and Audible Codes
Activity Beeps Possible Cause Recommended Action
Green Power LED
On.
None Computer on. None
Green Power LED
flashes every two
seconds.
None Computer in
Suspend to RAM
mode (select
models only) or
normal Suspend
mode.
None required. Press any key or move the
mouse to wake the computer.
Red Power LED
flashes two times,
once every second,
followed by a two
second pause.
Beeps stop after
fifth iteration but
LEDs continue until
problem is
resolved.
2 Processor thermal
protection
activated:
A fan may be
blocked or not
turning.
OR
The heatsink/fan
assembly is not
properly attached
to the processor.
1. Ensure that the computer air vents are
not blocked and the processor
cooling fan is running.
2. Open hood, press power button, and
see if the processor fan spins. If the
processor fan is not spinning, make
sure the fan's cable is plugged onto
the system board header. Ensure the
fan is fully/properly seated or
installed.
3. If fan is plugged in and seated
properly, but is not spinning, then
replace processor fan.
4. Reseat processor heatsink and verify
that the fan assembly is properly
attached.
5. Contact an authorized reseller or
service provider.
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