Got it fixed today... the pulley on the tensioner had seized up... plus the belt needed replacing. For anyone that is wondering how much it will cost you for parts in this instance....
$30 for tensioner pulley (the tensioner was fine)
$50 for serpentine belt (can you believe it???)
Of course, prices vary by location... but that's what it cost my pop.
p.s. does anyone know how to pop a belt back on quick? there's not enough stretch in the belt to just muscle it on there... tried this morning.