Samsung LCD TV Mod. LN40A550P3F

Multi problems
#1   Most functions on Remote have stopped working.  I know signal is being rec’d by TV sensor because I can see sensor light flashing when I press remote button (Factory & DTV Remote).
#2  Some controls on side of TV have also stopped functioning properly .  The Up & Down Arrows will not work when I have the Menu on the screen.

Unplug the TV from power, leave unplugged for 20 minutes, plug it back in and see if your problem persists.
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