Most likely failed capacitors in the power supply. I recently had the same problem with my 26 month old Samsung LN46A750. Samsung paid for the installation of an upgraded power supply board.
http://www.thebuzzmedia.com/samsung-tv-capacitor-clicking-issue-and-free-repair/
http://www.avsforum.com/avs-vb/showthread.php?t=1198409
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