This sounds like the only issue was your cable box was shut off. All you have to do when you are in a remote location is to bring up the on-screen remote and select the power button. This will send a signal to your cable box to turn it on.
After doing this, if you are still not able to see the video and since you already verified the cable connections, have a look at the following article:
- When I connect my set-top box to my TV with HDMI connections, I can't stream video at all using any version of SlingPlayer. Why?
Hope this helps!!!
Sling Media Moderation Team