4-2
Troubleshooting
Diagnosing with the LEDs
Diagnosing with the LEDs
When resetting the switch, or during a power-on self test (POST), LED patterns
on the switch may indicate a problem condition.
1. Check in the table below for the LED pattern you see on your switch.
2. Refer to the corresponding diagnostic tip on the next few pages.
Diagnostic Tips:
LED Pattern Indicating Problems
Diagnostic
Tips
Power Fault Port LED
Off with power cord
plugged in
**
➊
On Prolonged On *
➋
On Blinking
†
Blinking
†
➌
On Off Off with cable
connected
➍
* This LED is not important for the diagnosis.
†
The blinking behavior is an on/off cycle once every 1.6 seconds, approximately.
Tip Problem Solution
➊
The switch is not
plugged into an active
AC power source, the
switch’s power
adapter may have
failed, or Port 1 is not
receiving power from
a PoE power sourcing
equipment (PSE).
1. Verify the power cord is plugged into an active power source and to the switch.
Make sure these connections are snug.
2. Verify the PoE PSE is supplying sufficient power from a port that has an appro-
priate PoE priority.
3. Try power cycling the switch by unplugging and plugging the power cord back in.
4. If the Power LED is still not on, verify that the AC power source works by plugging
another device into the outlet. Or try plugging the switch into a different outlet
or try a different power cord.
If the power source and power cord are OK and this condition persists, the switch
power supply may have failed. Call your HP authorized network reseller, or use the
electronic support services from HP to get assistance.
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