I'm setting up an old Slingbox Pro that I was given as a gift back in 2009. I have an AT&T Uverse VIP1200 cable box. I have the component video/audio cables going from the cable box to the slingbox input and then another set of component cables going from the slingbox output to the TV. I can turn on the cable box and watch TV so obviously the signal is being passed through the slingbox but when I go to the sling website and try to watch TV it keeps giving the "No Video Signal" error. Does anyone know why this is?