Allied Telesis Layer 3 Gigabit Ethernet Switch x600-24Ts/XP - Manual (Page 56)

Chapter 4: Troubleshooting
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Power LED is Off
Check the PWR LED on the front of the switch. If the LED is off, indicating
that the unit is not receiving power, do the following:
ˆ Make sure the power cord is securely connected to the power source
and to the AC connector on the back panel of the switch.
ˆ Verify that the power outlet has power by connecting another device
to it.
ˆ Connect the unit to another power source.
ˆ Use a different power cord.
ˆ Check that the voltage from the power source is within the required
levels for your region.