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Maybe the outside fuse box has been turned off, or the house just has a lot of bad sockets that have to be replaced. First check the if the outside box is on, switch in up position. Then walk around with a small lamp and try it in all wall outlets to determine which are good or bad sockets. Then replace all the bad ones. With the power turned off again for safety.
Try another 4 wire phone cord from the wall jack to the phone it is possible that you have a bad cord. These phones will only work with a Meridian System .2 wires are line ,the other 2 wires are power to the phone. If you have another phone try plugging it into the same wall jack to check the jack/line itself. Anything else would be a defective phone/ lcd ( note you can have dial tone without display, but the unit will only access one line.
Any generic adapter will work as long as is is the same voltage and rating on the wall adapter you have. It is a 6 volt 400MA adapter. Radio Shack has generic adapters. Also try your adapter in another wall socket and see if that works.
There is two approaches we can try, unplug the power and the phone cord from the wall outlet for 10 minutes to see if the processor will reset, If that fails! take the main base apart to see if there is an open fuse on the main board, if yes! replace to see if it will restart the phone. But! if you find the fuse is good it means the board has been compromised and the phone will more than likely need to be replaced.
Unplug the main phone from the wall outlet, next unplug the phone line from the wall plug, let the phone sit for at least 30 minutes or more, the longer the better. If that fails! remove the coily cord from the handset and main base, replace it with another you might have around. If that fails the only option is to take the handset apart and check the two wires going to the speaker that goes to your ear, if the wire looks good, it is possible the speaker is bad.
Check the power brick in between the phone and the wall socket for your phone connection. The brick provides power to the display. make sure there is power green LED should be lit and the cables should be plugged in properly
I took it to a panasonic service center. They seem to recognize it and said its related to a flash ROM malfunction. Which usually needs to be replaced. In india they estimated the avg cost of replacing that to be around USD $20- $25. I have not got it fixed yet...
It is supposed to charge with either an adapter that plugs into the wall ie: DC 5V 400mA, or through a USB 2.0 port on your computer. The 1.1 USB ports do not carry enough current to properly charge any USB powered items.
Look for power on the InterTel system, any kind of lights on the system is an indication you at least have power to the system. If you are plugged into a power strip and have no lights, remove the power cord from the strip and plug it directly into an AC outlet. Be sure to turn off the system before plugging it into a wall outlet, and then turn the system back on. Good Luck