First, make sure there are credits showing on the credit reel. Also, check the coin switches to make sure they are in the open position. You can do a "force" start on the machine by manually pushing in the start relay (S relay) to see if it will begin the reset process. If you have a multi-meter, you can determine if there is any voltage at the start/credit button switch. With credits showing on the credit wheel, there should be approximately 25 volts at the start/credit button switch...