Power the machine down, and replace the operating system card with the clear card. Do not put it in the slot where the game card goes. Power back up, after a brief loading session, it will instruct you to turn the jackpot reset key to clear everything. I usually turn the key a 2nd time, just to be sure everything is cleared. Now, power down, and remove/replace clear card with operating system card. The machine will boot up but will have to be set up, and you are good to go. There are some good manuals and info out there on setup. Maybe check the NLG files for an instructional on setting your game up. If your existing game has progressives, that is a bigger pain in the ass to set up. No progressive, pretty quick and easy.