What could cause front end noise when first warming up the car? on 2007 Nissan Altima

When starting up my car about 10-15 seconds, a weird noise comes where the serpentine belt is but I just got that replaced, so what else could that noise be from? Tensioner pulley maybe?

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2 answers
take your belt off and start car to see if noise goes away
Tensioner or idler. Take belt off and see if the bearing on the pullys have any slack. Common probems