I own a Sega Mega Drive (Genesis if you're American) and the AC adapter is making a low buzzing noise. I felt it and it doesn't feel hot or anything. It's rather old. Is a low buzzing sound normal?

You may have to buy a new AC Adapter sounds like it's going bad. I found this on Google and I'm in America . The low buzzing sound is not normal also you said the Adapter is old that could be the problem.