trying to figure out how to reinstall the serpentine belt which popped off on 2000 Mercury Sable

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serpentine came off pulleys no reason
its a new belt not broken and all pulleys move
havent a clue no matter how easy its supposed to be
spent 6 hours for something that i know is a five min job so pls advise
(2) Answers
(2) Comments
Do you want to spend another six hours re-installing the belt...again? Find the reason WHY it popped off the first place and FIX that first! Then you can worry about installing the belt.