Something is causing a short on the keypad bus. It could be wiring, or the panel could have had a power surge. There is also a jumper on the main alarm panel board that could be shorted. Open the panel, and make sure there is no connection between the pins in the middle of the board marked RESET. If that isn't the issue, pop the keypad off the wall and make sure that there isn't a connection between the yellow and green wires. The wires are on a harness connected to the back of the keypad, so follow them back far enough to see where they connect to the wire going to the panel.
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