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Try another input on the set, if you have on screen display set is working to some degree, also try to unplug set and or box or other gear hooked to it for a while and power back to allow all to reboot or try to===problem is NO video or no rastor if menu comes on screen. Also please check which input the set is currently on......
Okay you TV is hooked to a comcast modem? or do you mean My tv is hooked to the comcast converter box? A no picture but sound you want to first check you cables also try hooking up a dvd to the tv and see if that picture comes on if not and you got no pic and sound this would mean the backlight on this tv is dead or you got a bad inverter not converter, inverter inside the tv. Meaning it needs the repairshop but try and hook up a dvd to it and see if you got picture if so you cable box might be the issue call comcast!
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try changing your resolution for your laptop before you plug in your TV, the screen refresh rate of your monitor,(click the following, control panel, personalization, display settings, advanced, monitor Tab). Also what make/model video adaptor are you using, try updating the drivers, if this helps, please give a fixya rating. Thanks