My Samsung txn3245fpnxxaa television only clicks when powered.

i recomed a new sterio for it. My new tv did that and i had to get a new one.

There's something wrong in the power source of the tv , very bad sign on a tv just 2 weeks old. Just take it back, not worth the hassle.

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Most likely a power supply component has aged and thus changed value and/or failed. Take it to a reputable repair person.

I have the same problem.

fixing the power supply should take care of the clicking, but this problem could be the lcd panel itself (no backlight) or the main board.

These sets have quit a complicated power supply and that is usually how they go. Everything is all good at turn off and then stop at next turn on. It could also be a horizontal/high voltage issue. It is hard to say as there are many probable causes. Thanks

Sounds like a capacitor on the power supply is bad. Easy fix.

check here: http://www.earthinfo.org/samsung-tv-makes-a-strange-clicking-sound/ [worked for me]

check the power regulator at power supply and filter cap