answer:If you’ve been able to successfully watch television shows from the computer/tablet on the TV, and you are just asking about the service from which to find the movie: Netflix, iTunes, or Amazon are where we rent or buy movies from to watch over the internet. You could check if your Cable/Satellite provider has the movie available On-Demand or Pay-Per-View, and not have to deal with the computer at all. I’ve not heard of a system that you can just connect the computer to the TV with a cable and watch what’s on the computer. Do you have a “smart” TV that has internet access? Do you have an AppleTV or SlingBox or ChromeCast to send content from the internet to the TV? If the cabled connection is not working, it would be helpful if you tell us exactly what type of computer or tablet you’re using (including the operating system “OS”), and what type of cable you bought to connect it to the TV. Even if you do have it working, I’m just curious about your setup, because it’s new to me.