Thanx for your response, however, although the TV has HDMI my old GPU which I was using at the time I tried the connections, hadn't. It was an Nvidia Geforce 240 GT (I think). I have since (just) bought a new GPU namely an Nvidia Geforce GTX 650Ti Boost. Which (happily) does have an HDMI connection.
I'll have to go through my cable stash and find a spare HDMI, I'm sure I have at least one. Over the past few months I've been playing TERA, I've reached level 46 and am a Mystic with green hair.
It's often very slow and I have tried many things to help with the gameplay. Someone suggested I get a new GPU, but it hasn't made any difference. So now I'm upgrading my CPU from an Intel i3 Dual Core Sandy Bridge to an Intel i5 Quad Core Ivy Bridge with a Turbo Boost. Fingers and toes crossed.
I was only intending to play TERA as a stop gap, while waiting for Elder Scrolls Online next spring. But I'm hooked now and unlike for ESO it's free.