I cannot get comcast remote to work on slingbox 350. I have audio and video but cannot change channels. I have connected the slingbox 350 to one of comcast secondary boxes. I split the hdmi and sent one to TV. I then took the second hdmi and converted it to component and connected to my slingbox 350. I have audio and video but cannot switch channels. I have selected many remotes from the pick menu with no luck. Any one solve this?