It sounds like you might be dealing with copy protection in your cable box called SOC (Selectable output control). Basically, what happens is the cable box detects that it is outputting a its video signal to both a TV, and some other media device (the Slingbox). However, it doesn't recognize a Slingbox, so in order to prevent a device it doesn't recognize from downloading and/or stealing the content, it shuts off the video signal to that device. Therefore, great sound, but no picture.
I would keep everything hooked up in your Slingbox the way it is in 20150518_203214.jpg (the first picture). This includes the component cables in the "OUT" section of the cable box. Then, try removing the HDMI cable from the cable box. This should give you both colored video and audio in your Slingbox.
Lastly, in order to get the video signal back on your TV, I would recommend running a second set of the component cables from the Slingbox (out) to the TV, and switch your TV to the component input. This should bypass the SOC copy protection in your cable box.
This article covers the topic of "No Video Signal" issues, and discusses the situation you're likely experiencing:
Let us know if this doesn't fix the issue!
Thank you Eric! I bought another component cable and disconnected the HDMI from the Set Top Box. I now have color sound and have only one remaining problem. I can't seem to get the channels to change and anything from the remote to respond. I went to my settings and reconfigured the input putting in all variations that I could think of for my Cisco Scientific Atlanta RNG 200 DVR and I get a remote that looks exactly like the one I have but doesn't change channels. It pauses the pic briefly as if it is trying to respond but then resumes the original channel. Any more ideas? I wonder if it could be the set top box itself. If they are blocking DRM which is what it looked like they were doing, could they also block the remote?
I tried two ways to hook up my new slingbox 350: each with an error message:
The first way:
I hook the slingbox up with the component green blue and red cables in the "out" section in the cable box (the middle column) and the corresponding colors in the slingbox (the white background "in" connections 2nd row) I didn't use the yellow cables. I get great sound but an error message that says weak or no video signal. There are three green lights in the streaming section in the app on my ipad and also on my android phone and laptop. My TV is hooked to the cable box with HDMI cord only.
The second way:
I moved cables around (picture attached ) and put the green blue red component cables in the "archive " video connection which has yellow blue and red sockets on the back of my cable box which is a Cisco for Comcast. I left the red white audio as originally installed and I still get great sound but only a black and white picture and no ability to control the remote. . I still have three green lights showing.
I have attached my connections pictures (excuse the dust) of the cable box and the slingbox connected the second way. . These pics show the connections that will only give me a black and white picture, good sound and no remote control from the ipad or phone. I am out of ideas. Can anyone help? Should I try a factory reset?