Artylad,

Under the Light Effect section of the manual, you are able to adjust that light so that it's on or off. It may have been changing a setting that may have caused the initial issue, but if this continues you might try to contact the Samsung customer service center in your region.

Here's a snippet from the U.S. manual:

http://i397.photobucket.com/albums/pp60/samsung_hd_tech/Lighteffect.jpg

--HDTech