Cox Cable and DirecTV?

I am currently living with my folks, who recently got rid of Cox Cable and signed up with DirecTV.  I wanted to keep Cox Cable so I could use my Tivo.  I went to a Cox Connections store, where my parents and I signed up with a Roommate account where I pay for Cable (and internet that isn't being used, but that's my choice), and they are paying for internet.  Since this change has been made, I am not getting any TV channels and my Cable Card box just blinks non-stop.  Is there a way to have a house wired for both Cox Cable and DirecTV?  Is this something I can fix myself or do I need to have a technician come out to fix whatever is wrong?

Thanks!