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Diagnosing LED Indicators
System Self-Diagnostic Test Failure
Troubleshooting
Table 12: Troubleshooting Chart
Symptom
Action
◆
Power LED is Off
◆
◆
◆
Diag LED is blinking
Amber
◆
◆
Diag LED is blinking
Amber with PoE Mode
◆
button pressed.
◆
Link/Act LED is Off
◆
◆
◆
◆
If the Diag LED indicates a failure of the system power-on-self-test (POST), you can
use a console connection to view the POST results. The POST results may indicate a
failed component or help troubleshoot the problem. For more information on
connecting to the console port and using the CLI, refer to the Management Guide.
Note a POST failure normally indicates a serious hardware fault that cannot be
rectified or worked around. If you encounter a POST failure, you should contact
your dealer for assistance.
Check connections between the switch, the power cord, and the AC
power outlet.
Check the AC power outlet is supplying 110-240 VAC.
Contact your dealer for assistance.
Power cycle the switch to try and clear the condition.
If the condition does not clear, contact your dealer for assistance.
Turn off or unplug PoE devices until the condition clears.
If the condition does not clear, contact your dealer for assistance.
Verify that the switch and attached device are powered on.
Check the cable connectors are firmly plugged into both the switch
and corresponding device.
If the switch is installed in a rack, check the connections to the
punch-down block and patch panel.
Verify that the proper cable type is used and its length does not
exceed specified limits.
Check the attached device and cable connections for possible
defects. Replace the defective cable if necessary.
– 44 –
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