comcast has been telling customers in numberous ways everyone will need a box and they are giving them free in most markets. They allow the all digtal signal to be converted to analog for older type tv's. once installed they need to be activated, which can be done by calling a 1800 number that comes with the devices. since yours will not activate you need a tech. you need to be home when the tech is on the way or they will cancel your appointment. Also if you have a new tv like an hdtv flat panel you will not want this box. You are probably having a signal issue or a bad box. you can also send an email here.
Though it’s not clear this is primarily a customer to customer forum
To get help, you can drop a note to Comcast corporate customer service (we_can_help@cable.comcast.com).
For the quickest response, please include:
Your full name;
Service address;
Phone number & an alternate number if possible;
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A link to your post
