my tv is clicking but wont turn on, why?

It could be a number of things... knowing the type of TV you have, plus the make and model would also help. ;-)

In the mean time, if its a Samsung LCD, there is a known issue with capacitors failing after a few years. It won't turn on, but it'll make a clicking sound. You can read about how to fix the problem on this webpage... thankfully the fix is fast and cheap.

You might try resetting the tv. Look in the manual for how to do that. Fixed mine that way once but with a different problem.

probably bad capacitors.

If you don't know what that means, then you should probably have a qualified repair tech look at your tv, or send it in to retailer/manufacturer for warranty repair.

If you know what that means - then you know with a soldering iron and some online ordering you can get replacement parts for just a few bucks.

http://www.youtube.com/watch?v=72sJ5Infuu0
http://www.youtube.com/watch?v=Ytw57212X2o