Interpreting Diagnostic Lights - HP dx2308 - Microtower PC Service & Reference Manual

Interpreting Diagnostic Lights

This section covers the front panel LED codes that may occur before or during POST that do not necessarily
have an error code or text message associated with them.
NOTE:
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.
Replace the system board or power supply only as the last resort.
Activity
Green Power LED On.
Green Power LED flashes every one
second.
Green Power LED flashes every two
seconds.
Green Power LED flashes four times
per second.
ENWW
If you see flashing LEDs on a PS/2 keyboard, look for flashing LEDs on the front panel
Possible Cause
Computer on.
Processor thermal protection
activated:
A fan may be blocked or not
turning.
OR
The heatsink/fan assembly is
not properly attached to the
processor.
Computer in Suspend to RAM
mode (some models only) or
normal Suspend mode.
Pre-video memory error.
Recommended Action
None
Ensure that the computer air vents are not blocked
1.
and the processor cooling fan is running.
Open hood, press power button, and see if the
2.
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.
WARNING!
cause serious bodily harm. Be sure to keep
your hands away from the rotating blades.
If fan is plugged in and seated properly, but is not
3.
spinning, then replace processor fan.
Reseat processor heatsink and verify that the fan
4.
assembly is properly attached.
Contact an authorized reseller or service provider.
5.
Press any key or move the mouse to wake the computer.
CAUTION:
To avoid damage to the DIMMs or
the system board, you must unplug the computer
power cord before attempting to reseat, install,
or remove a DIMM module.
Reseat DIMMs.
1.
Replace DIMMs one at a time to isolate the faulty
2.
module.
Replace third-party memory with HP memory.
3.
Replace the system board.
4.
Interpreting Diagnostic Lights
Rotating fan blades can
89