Troubleshooting no power when a phone is using PoE (Power over Ethernet)
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This article provides troubleshooting instructions for when a phone uses Power over Ethernet, but the display is blank and with no light indicator.

Problem
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* The IP phone does not boot up successfully.
* IP phone led light indicator is not lit.
* The IP phone screen is not displaying anything.

Cause
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* The IP phone is using a bad ethernet cable.
* The IP phone is plugged into a wrong port of a router/modem.
* The Firmware of the IP phone may be broken.

Resolution
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* A PoE-compatible and compliant switch or router is required. Deskphones are auto-configured to use the correct power level using 802.3af, which all unmanaged and managed switches support by default.
* Make sure that the deskphone is not plugged into an AC adapter.
* Make sure to use a working ethernet cable, and the ethernet cable is securely plugged into the LAN port at the phone's back.
* Make sure to plug the other end of the ethernet cable into a working ethernet port on the router/switch.
* Plug the phone to a known good port on the PoE Router/Switch (preferably a port that has a device connected to it powered on by the PoE source to make sure the port is working).
* Plug an AC power adapter into the phone. If the phone turns on using AC power, contact your local IT to fix your network. If the phone does not turn on using AC power, then the phone needs to be replaced.

For a device replacement, contact support and provide the device's serial number to check if the phone is from RingCentral and in-warranty or a third-party vendor.