Thanks for your response, but as I had said,"Now my M2 thinks I am using an HDMI cable, but it is and has always been a component cable."
I now think the power glitch disrupted something within the Slingbox that may be fixable by doing a reset and reinstall (as opposed to merely shutting off the power for half a minute.) I'm going to try that tomorrow morning.
It's possible you may be getting some form of SOC, which will prevent you from getting any video to your Slingbox when using an HDMI to your set-top box. Since you did mention it worked previously with the set up you have now, your set-top box may have gone through an update. The links below will provide more information on this. Hope this helps!
- Slingbox.com - I get no video with any SlingPlayer (Watch, Windows, or Mac OS)
- Slingbox.com - Troubleshooting "No Video Signal" errors during setup
Sling Media Moderation Team
Thanks to all for your help. I had installed a "component cable" purchased from direct TV and had no problems with remote viewing via Slingbox until a couple of weeks ago when there must have been a software modification. As a number of you surmised, my "component cable" was actually an HTML to component cable, which is no longer suitable. After trying everything else, I finally had my son-in-law disconnect the HTML connector from the Slingbox and the problem was solved. Thanks again,
My M2 was working fine. Then there was a power glitch at home. Now my M2 thinks I am using an HDMI cable, but it is and has always been a component cable. A relative unplugged power from M2, waited 30 seconds and plugged it in again. Same problem! I'd appreciate any suggestions.