Since you are having issues with the coaxial input of your Slingbox and it works on your TV, my recommendation for you is to scan the channels again. Please, check this link in order to retrieve the information:
Give it a try and post back if you require additional assistance.
No resolution as of yet, even after reviewing your topics.
However, the problem has now extended to all inputs of the hd pro.
All show weak, no signal.
This device has worked for a few years and has now started to stop working???
No devices have been changed, I have always had the same model cable box and tuner input.
It could be that the power supply for your Slingbox is failing. There are several threads in the help forum that describe similar types of problems, that were resolved when a new power supply was obtained, either from the Slingbox purchase site or from a third party supplier of equvalent power supplies.