I'm brand new to FTA and anxious to get started. I got a complete Dish 500 set up with an old Echostar 4700 receiver with a blue card for about $10. I wanted to get NASA TV as my first venture into FTA so I set up the dish, turned the receiver on, and immediately got a strong signal and received NASA TV and a Dish preview channel. However, after only about 30 minutes of flipping through the (mostly blank) channels and accepting a software upgrade, I now get nothing. I notice that the card SN is all zero's. Can I do something to get NASA TV on this setup again? I can access the menu and do the system setup - I still have a strong signal, but the main screen locks on step 0 of 5 in "Acquiring satellite signal".