Flint

Just got my car back from having its power steering pump replaced, but now its emitting a strange, high-pitched sqealing sound. Its a completely different sound than the whining when the pump leaked. I'm fairly certain its coming from the pump, at least. Its very disconcerting, any ideas?

SharkSkin

Is the belt tight? Try dripping some clean water on the belt while it's squealing to see if the sound changes.