Imac to jvc
Hi. A couple of things to try.
Switch everything off. Make sure your connections are sound then switch on the TV. Then switch on the mac. With luck the system should sort itself out. However, I have heard of others who have had nothing but grief trying to get similar arrangements to work.Normally ther Mac does it's own thinking, works out what is at the other end and puts up the display without any problems - other than the picture width being invariably wrong until you find the correct size.
There are no drivers to download - the issue is generally that the TV is not reporting back to the computer the correct resolution and scan rates.
You may have to dive deeper into the TV's menus to locate the means of altering the parameters.