I understand you are having a no video issue with your Slingbox M1. Below are some helpful links:
Sling Media Support!
Thanks for your reply. I believe my problem is that my cable source is an RF source but I need an IR source. Is this correct? Do the other slingboxes work the same way? iI mean , what if I placed the sling box in between my cable box and tv? Would that still affect me not being able to control video without IR signal?