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If the dot matrix printer does not have a built-in network card then it will not have a MAC address. Dot matrix printers are very old printers and I have not come accros any with built-in network card or print servers.
The dot matrix can be connected to a network print server and this will have a MAC address and a configurable IP address.
Driver could be corrupt. Disconnect the printer or at least be sure it is turned off.
I'd do both and reinstall the CD software program that came with
the printer. When the software program asks you to connect the
printer to the USB port, do so and it should again work properly.
Hope this helps. Bud
The main thing you stated that makes me feel the issue is with a line. Maybe not ADT. Security systems sit idle until needed. However, if it is an older system and has a failure, it could seize the line and disconnect. But with the static issue, it does sound like an inside wiring issue. There may be a short in the connection to the alarm system. I would call an independent wiring person. They are cheaper and can test from end to end. When two companies like this are involved sometimes finger pointing slows getting a resolution. So this takes care of that. Also, if there is a short they will usually reconnect it so you know you have a good connection. If this helped, please rate my response. And feel free to respond if you have any additional questions.