Power button makes a click, click sound

My TV was working fine. I turned it off. Several hours later I tried to turn it on via the remote. When it didn't work I pressed the power button, but just heard a click, click, click sound. The TV wouldn't come on. I changed where I had it plugged in, tried again, tripped the power cord, tried again, all I get is click, click, click.

I really don't want to have to buy a new TV even though my loyal TV has served me for 12 years.

Dee