Thanks for using the forums. Sorry to hear you are having issues with the TV using an HDMI cable. You are actually running in to what is called HDCP, which is a form of high definition copyright protection. This is caused by the cable box itself recognizing that something other than the cable box is connected, and it thinks that you are trying to "steal" the cable so it in turn shuts down the signal. The fix for this would be to remove the HDMI cable and use component cables as a passthrough. Please find an article below for more helpful information about this.
Hope this helps,
The Sling Moderation Team
Katie thanks so much for the reply. You'll be interested to know that my slingbox 500 was setup using component cables just like described n the setup guide and was working perfectly for over 9 months before I encountered the current problem. I disconnected the slingbox for a couple of days, then reconnected it in exactly the same way as previously,
and it works again!
I have no explanation for this, as I looked at possible issues such as loose or bad cables, didn't find the source of the issue. And to be clear, the issue was NO PICTURE Or Sound, and no response if the sling remote. So no live tv either until I disconnected the slingbox from my setup. I'm guessing maybe there was something loose, although I checked and re plugged on every cable that first time.
So I'm good now. Confused, but everything is working again.
Ps I'm aware of the hcdp issue which is why I'm using component cables. But my setup also had hdmi for TV and it worked fine every day but one. Go figure.
Sent from my iPhone