Well, if he hit the cash out button and it "locked up" it is probably in hand pay mode waiting for someone to turn the jackpot reset key that is on the right side of the cabinet above the pull handle. If he doesn't have the key inserted into the slot (or has no key), the keys are under $5 to buy. You can tell if the machine is in this mode as the VFD (blue matrix display) says Call Attendant and Handpay displayed alternatively. If that is not the case, we can still figure out how to fix it. These machines are not all that complicated to fix and parts are easy to come by.