Also, how's your power steering fluid level? Those pumps can make some pretty bizarre noises on cars if they are sucking air. Also, once air gets in there, it can sometimes take a while (and some lock-to-lock turning) to bleed the air back out of the system.
Terry's suggestion is better -- start with the belt itself, then move down to checking the accessories like a PS pump. Just don't run for very long without the belt on!
Cheers, John