My step-father picked up a Scientific Atlanta 3100HD box from the local Comcast office. He installed it himself, i.e. no comcast service call for the install. He has it connected to his Sammy DLP TV via component video 1. On all of the HD channels there is analog audio, but no signal is detected by the Sammy when I switch the input to component 1. Any thoughts? Is there a service menu for the box we need to access?