Thanks for reaching out to us here! I do apologize for any inconvenience you're experiencing trying to connect and set up your Slingbox. It's hard to say exactly what is causing the issue, but the first thing that I would advise would be to try connecting the Slingbox directly to your router via ethernet. This will help to isolate the issue and determine if the switch (wall jacks) are causing the issue. Once hardwired to your router, you should be able to run through Setup on Slingbox.com with no video. If you are able to complete the set up you can then return the Slingbox to the permanent location and hopefully get a connection.
Hope this helps!
The Sling Moderation Team