46 inch Samsung HD clicks but won't turn on. First notice several weeks ago when using remote to turn on tv, it would click a few times and come on. Over a period of time, it would click for longer and longer periods of time before turning on. Now it clicks constantly and will not turn on.

Hi
A common problem for these is bad capacitors in the power supply, Remove the back from your Tv and look at the power supply on the left hand side.

You will see roughly around 9 x capacitors that are bulged / domed shaped on top usually these are valued at 3300uf 10V any that have bulged or leaked a brown like substance should be changed.
This will cure the problem as they overheat being sat next to a heatsink that gets very hot!
Try and change them for the same 3300uf but a higher voltage.
Hope this helps