If clearing does not solve your issue, you need to start eliminating points of failure. If you successfully cleared the machine, you may have an issue with your reel controller (the little tray box that is above the reel in the middle, usually has a barrel lock key on it). I would pull it out and inspect it for something burned or damaged. Whenever you pull things in and out of these machines, it needs to be with power OFF. We cannot stress this enough, people think they can just hot plug things and not cause any damage, IT DOES, so never plug or unplug things with power on (other than maybe usb connections).