Do you mean use the TV as an external monitor? Or do you want to run TV on the Mac potentially recording some shows onto your hard drive. I used to do the latter. I had a device (a little box) with a audio/video in (both RCA and coaxial cable options) connecting to the TV and a USB 2.0 (I think) connecting to the computer. It was very nice. I'd watch TV on the Mac. The software that came with it allowed me to setup times to record shows, which channels they were on, ........, etc etc. That's been a while and I don't remember the name of that little device. But I got it in the Mac section of the computer store. There are similar devices now being sold at the Apple Stores. They look pretty nice. You might be able to go either way (i.e. putting computer video onto TV or putting TV onto computer), I don't know.