If you know someone else who has a free standing dish, try using theirs to see if it will work with your wiring. One other thing, there are two of CATV type connectors on the back of your box that should have a short lead from both that goes to a coupler, then a single line to your satellite.
Also, do you have an inline meter? They tend to be more sensitive and respond faster than the signal indicator screen on the TV.
I would always recommend either buying your cables or get someone from a dish installer to make them for you. Cables are critical.