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Interpreting POST diagnostic front panel LEDs

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Interpreting POST diagnostic front panel LEDs 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. WARNING! When the computer is plugged into an AC power source, voltage is always applied to the system board. To reduce the risk of personal injury from electrical shock and/or hot surfaces, be sure to disconnect the power cord from the wall outlet and allow the internal system components to cool before touching. 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. Not all diagnostic lights and audible codes are available on all models. Table 10-2 Diagnostic front panel LEDs and audible codes Activity Beeps Possible Cause Recommended Action White Power LED On. None Computer on. None White Power LED flashes every two seconds. 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 2 Processor thermal 1. Ensure that the computer air vents are not times, once every second, protection activated: blocked and the processor cooling fan is followed by a two second pause. Beeps stop after fifth iteration but LEDs continue until problem is solved. A fan may be blocked or not turning. OR 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 The heat sink/fan plugged onto the system board header. assembly is not properly 3. If fan is plugged in, but is not spinning, then attached to the processor. replace heat sink/fan assembly. 4. Contact an authorized reseller or service provider. Red Power LED flashes three 3 Processor not installed (not 1. Check to see that the processor is present. times, once every second, followed by a two second an indicator of bad processor). 2. Reseat the processor. pause. Beeps stop after fifth iteration but LEDs continue until problem is solved. 140 Chapter 10 POST Error Messages

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Interpreting POST diagnostic front panel LEDs
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.
WARNING!
When the computer is plugged into an AC power source, voltage is always applied to
the system board. To reduce the risk of personal injury from electrical shock and/or hot surfaces, be
sure to disconnect the power cord from the wall outlet and allow the internal system components to cool
before touching.
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.
Not all diagnostic lights and audible codes are available on all models.
Table 10-2
Diagnostic front panel LEDs and audible codes
Activity
Beeps
Possible Cause
Recommended Action
White Power LED On.
None
Computer on.
None
White Power LED flashes every
two seconds.
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. Beeps stop after fifth
iteration but LEDs continue until
problem is solved.
2
Processor thermal
protection activated:
A fan may be blocked or
not turning.
OR
The heat sink/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.
3.
If fan is plugged in, but is not spinning, then
replace heat sink/fan assembly.
4.
Contact an authorized reseller or service
provider.
Red Power LED flashes three
times, once every second,
followed by a two second
pause. Beeps stop after fifth
iteration but LEDs continue until
problem is solved.
3
Processor not installed (not
an indicator of bad
processor).
1.
Check to see that the processor is present.
2.
Reseat the processor.
140
Chapter 10
POST Error Messages