Again, this can be related to a number of issues, but it doesn’t automatically mean the phone is dead. The first thing to check is whether the cord is plugged into the proper port on the back of the phone. Most Panasonic phones have at least two ports. Digital phones may have a “PBX” port and an “EXT” port. For the phone to properly function, it must be connected to the system through the PBX port.
IP phones will have the main port as well as a pass-through port that can provide an internet connection to another device. Like the EXT port on the digital phones, it will NOT power on the phone. It must be connected through the main port. If you are not sure which is which, simply try both. If neither works, it is possible that the jack you are using is not properly connected to the phone system. The easiest way to check is to use a known working phone to test that jack. If the phone doesn’t power on at the new location, it is most likely a connection issue.