Since we don't have many details, I will have to be vague in the repairs. If you call Comcast, they would be glad to assist in installation.
Here are the manuals:
Comcast
http://customer.comcast.com/help-and-support/cable-tv/cable-box-user-manuals/
Insignia DVD Player
http://www.insigniaproducts.com/cms/documents/NS-P8DVD%20UM%20EN.pdflayer
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