Your internet connections is working? If so its really not likely to be something outside your home. Anything else connected to your COAX wiring other than TV's, your STB's, and the router? E.g and tv antenna amp. THE ONE odd thing I heard is that your STB Network screen will not come up.
Sounds like you went through most of the things that can go worng. The STB, router, ont and the wiring between them.