what causes my serpentine belt to break on 2000 Lexus GS300

this problem just occured a few days ago with this strange noise like a chain rotating with alot of slack

by in Virginia Beach, VA on December 25, 2010
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1 answer
ANSWER by , May 09, 2011
More than likely the bearing in one of the accesories (Alternator, Power Steering pump, A/C compressor, idler pulley, etc) failed.