What I understand from your post, is that you can't get video using the Slingbox Solo.
In this case, besides try a different set of cables or make sure the Slingbox is connected to the TV1 output.
I would recommend to check the following link about an HDMI connection (most of the HD Sources come with that feature) in case you are using it. Also,
Besides that, you can try to connect the Slingbox to a different Audio and Video Source to discard the current one as a potential issue.