Reviewed the manual on the AOA system for the initial setup of the display unit. Powered up the system and followed the steps but never got a red LED light confirming a reset on the system. Repeated the process twice with the same results. Called Elbie at the company and reviewed the indications seen on the unit. He indicated that there was still a problem with the display unit and he was going to send out an exchange unit. It will be in next week.