I had that exact same “hum of death” from my disposal last Christmas right when I had 10 people coming over! It’s the worst timing. I tried to fix it myself with a coat hanger (bad idea, don’t do that) and ended up making a tiny leak in the pipe. We finally called a local plumber ottawa https://superiorplumbing.ca/ottawa/ and I honestly wish I’d just called them first. They were great—the tech actually found a small piece of a broken shot glass that had wedged itself perfectly into the impeller. He cleared it out, checked all the seals, and even gave me some advice on what NOT to put down there (apparently potato peels are the enemy). They were very fast and the price was much lower than I expected for a same-day visit. Definitely worth a call!