user manual

C–4 361685-001 Service Reference Guide, dx5150
POST Error Messages
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. The
Power LED will
continue flashing
until the problem is
resolved.
None Computer in
Suspend to
RAM mode
(some 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.
The Power LED will
continue flashing
until the problem is
resolved. (Pertains
to CPU fan only)
None 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. Leave a
4-inch (10.2-cm) clearance at the
back of the system unit and above
the monitor to permit the required
airflow.
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.