Troubleshooting no power when a phone is plugged into AC power adapter
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This article provides troubleshooting instructions for issues when the phone is connected to an electrical outlet using an AC power adapter, 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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Power failure for IP phones may be caused by the following:

* The IP phone is using the wrong power cord.
* The IP phone is plugged into a lousy power socket.
* The firmware of the IP phone may be broken.

Resolution
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* Make sure that the cables are correctly connected. Ensure that the power adapter is securely plugged in.
* Make sure to use a working electrical outlet. Try plugging the phone into another electrical outlet.
* Make sure that the power adapter is working. Plug the device into a spare adapter and check if it's working. If it turns on using the extra power adapter, then you should replace the original power adapter.
* If you have another working device of the same model, plug it into the original power adapter. If the other device works using the power adapter, the device 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.