deerslayer

Hi, My prius is making an annoying hum. The tires are new in April and not snows. The car has been put on a lift and wheels do not make noise. Front bearings replaced one year ago. (only real repair needed aside from one brake and rotor replacement, remember 197,000 miles!. Wondering if there is a drive issue causing the noise that is more of an internal medicine issue as opposed to the bearings/tire noise easy fix. Hate to have the $$$$dealer look at it, but I may have to. Any thoughts out there?