HP dx2308 HP Compaq dx2300 and dx2308 Business PC Service Reference Guide, 1st - Page 97

Interpreting Diagnostic Lights

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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: 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. Replace the system board or power supply only as the last resort. Activity Possible Cause Recommended Action Green Power LED On. Computer on. Green Power LED flashes every one Processor thermal protection second. activated: A fan may be blocked or not turning. OR The heatsink/fan assembly is not properly attached to the processor. None 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. WARNING! Rotating fan blades can cause serious bodily harm. Be sure to keep your hands away from the rotating blades. 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. Green Power LED flashes every two Computer in Suspend to RAM seconds. mode (some models only) or normal Suspend mode. Press any key or move the mouse to wake the computer. Green Power LED flashes four times Pre-video memory error. per second. 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. 1. Reseat DIMMs. 2. Replace DIMMs one at a time to isolate the faulty module. 3. Replace third-party memory with HP memory. 4. Replace the system board. ENWW Interpreting Diagnostic Lights 89

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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:
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.
Replace the system board or power supply only as the last resort.
Activity
Possible Cause
Recommended Action
Green Power LED On.
Computer on.
None
Green Power LED flashes every one
second.
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.
WARNING!
Rotating fan blades can
cause serious bodily harm. Be sure to keep
your hands away from the rotating blades.
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.
Green Power LED flashes every two
seconds.
Computer in Suspend to RAM
mode (some models only) or
normal Suspend mode.
Press any key or move the mouse to wake the computer.
Green Power LED flashes four times
per second.
Pre-video memory error.
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.
1
.
Reseat DIMMs.
2
.
Replace DIMMs one at a time to isolate the faulty
module.
3
.
Replace third-party memory with HP memory.
4
.
Replace the system board.
ENWW
Interpreting Diagnostic Lights
89