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Dec 14, 2013 3:01 AM in response to lorenzo.ivby mende1,Welcome to Apple Support Communities
Your iMac has got Mini DisplayPort, the port used to connect external displays. You cannot use FireWire or USB to connect displays.
What you need to do is to look at the ports your TV has got and get the Mini DisplayPort adapter and the cable you need. For example, if your TV has got HDMI, get a Mini DisplayPort to HDMI adapter and a HDMI cable