Sound like some dry bearings to me. Try spraying some KROIL in there to loosen it up then follow with some lightweight machine oil. If it spun freely by hand and still hummed without turning then I'd say the capacitor might be bad.
2006 23B Hybrid with 10k round bar WDH
2011 F150 4x4 SCREW Ecoboost, Max Tow, Integrated TBC, 3.73 LS axle, Firestone Ride Rite airbags.