My phone is completely dead, no display and no lights on the display. What is wrong?

If the display on your phone is completely blank and has no lights on it, this is a good indication that it is not receiving power. Polycom phones can receive their power from a power supply or via the network cable/PoE. If your phone has an external power supply ensure that it is plugged into a working A/C outlet and ensure that the plug is firmly plugged into the outlet and to the back of the phone. If your phone is powered by the network cable/PoE, ensure that the Ethernet cord from your phone to the wall jack is securely plugged in and is not damaged. If the cord is damaged, replace with a known good, working Ethernet cable.