OR - click (don't hover) on their user name/avatar. It will tell you when they were last on the site. (Because while some people never come back at all, some still come on the site but they never come back to their post and tell us how their issue got resolved.)They never responded on the original post 2 years ago. Check your dates when responding to post.
It's better to create a new post / question.
Most whine sounds in radio are due to a bad diode in the alternator.