I posted my dilemma over on the Apple boards and am having a problem getting people to understand my problem. Hopefully I'll have better luck here. I copy and pasted my post from over there, to here. Please note where I have used the words "wired" and 'wireless". THANKS to those who may reply: I have a new iMac Retina coming tomorrow and have a slight problem I don't know how to handle. I am a first time Mac user so please understand that. Here is the problem: I accidently ordered a Swedish wireless keyboard instead of a WIRED U.S. keyboard. So I went down to the Apple store and purchased the correct wired one. ( I didn't want to cancel and re-order and Apple already said they will change out at the store for me later) Anyway, it is my understand that the iMac comes already configured and Bluetooth paired to whatever peripherals one has originally ordered. I also ordered the Trackpad instead of the mouse. So now I don't know at which point to change out the wireless Swedish keyboard for the US wired! Is it like on a PC? Where I just plug in the wired before the first boot and the Mac will just see it and instantly replace what it was configured for and accept the wired and forget about the wireless? Or is it going to insist on the Swedish one? I don't speak Swedish or know that language so I am scared that it is going to asking me to type in all the setup questions that I won't be able to type in Swedish. Has this even happened to anyone that can help me? THANKS!