Zenith XBS344 DVD/VCR Combo Player makes strange humming sound

Selling this Zenith DVD/VCR combo unit, model XBS344. It's the silver version and is a nice space saver if you need both formats in one spot. It does make a strange humming sound when it's turned on, so keep that in mind might be an easy fix for someone who knows their way around these or just good for parts. Cosmetically it has some scratches on the top and edges from use over the years. No remote included, just the unit as seen.