HP Dx2250 Troubleshooting Guide - Page 20

Interpreting Diagnostic Lights - ram

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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 Green Power LED On. Green Power LED flashes every one second. Possible Cause Recommended Action Computer on. None Processor thermal protection 1. Ensure that the computer air vents are not blocked activated: and the processor cooling fan is running. A fan may be blocked or not 2. Open hood, press power button, and see if the turning. processor fan spins. If the processor fan is not spinning, make sure the fan's cable is plugged onto OR the system board header. Ensure the fan is fully/ The heatsink/fan assembly is properly seated or installed. not properly attached to the processor. 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 Press any key or move the mouse to wake the computer. mode (some models only) or normal Suspend mode. Green Power LED flashes five Pre-video memory error. times, once every second, followed by a two second pause. 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. 14 Chapter 2 Troubleshooting ENWW

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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 five
times, once every second, followed
by a two second pause.
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.
14
Chapter 2
Troubleshooting
ENWW