If TV is completely dead, no green/orange light, no any clicking sounds after you unplug it from the wall outlet and plug it back in - it is a problem with Power Board. Best case scenario - It's just a fuse that needed to be replaced. You have to remove back cover and locate fuses (1-4) on the board that power cord is attached to. You have to use multimeter to check it. If fuses are OK - next step is to replace whole power board. But before you do anything - make sure you got power out of the wall outlet and/or your power strip is in working condition.