11 HP Briggs& Stratton riding mower makes a clicking noise when started. I don't know if this is normal or what. Its model # 252707. Anything I can do to fix this? Is it bad?

Recently, my heat pump has started to make a clicking noise when it is turned off. The clicking is about one second apart and is continuous. I thought that it was one time occurrence, but when I checked after a day's time, it was still clicking. The thermostat is switched completely off. ...

My air conditioner/heater makes the usual rumbling noises that are pretty typical but... just about an hour ago it started to make a constant clicking noise. One click every 7 seconds, like someone is tapping the inside of it. What could this be? I have tried everything from turning it off/up to...

There is clicking noise in the pipes after I turn the faucets on, which is initially quite rapid & then slows. It started about 3 weeks ago. Thanks

Sony Triniton makes a loud clicking noise when starting up. It's a brand new TV. The noise it makes vibrates the TV trolley and is too loud. It happens even if it is on standby for 10 minutes. Please advise Thanks Amit Jain