In setting up my brand new Mac mini, the wireless mouse paired with no problem, but I'm having trouble with the keyboard. I am using an older mouse and keyboard from my previous mini, which is completely shut down. The keyboard shows as being connected to the computer, but when I enter the code and press Return, the code disappears and nothing else happens. After a while the code reappears and I repeat the process with the same results. After several attempts, nothing else happens. I've tried rebooting twice, checked the keyboard batteries, made sure the keyboard light is blinking to show it's discoverable, but I can't move past this screen. I don't know what else to try. Please help!