A popping noise is never good, especially if a machine is powered on. It definitely sounds like an electric issue, you could try removing your main shroud, checking if your Motor Control Board (Circuit Board) is lighting up with the power on, inspect the board for any burnt or visually damaged parts, if any it is a probable cause of the issue. You can also check the fuses on your board if any for continuity, if they are bad replace them. The next thing is your main console, if you can swap it out with one you know is good then please do so, if you swap it and the machine works, the problem is your console. If not, you will need to further troubleshoot you machine. Can be one of a few things, if you need any further help after the basic checks you can contact our Technical support Team by chat at
www.sportsmith.net or by phone at 888-713-2880 we would be happy to help you and look forward to hearing from you!