If you need to pair your keyboard with another device or a new computer and the wireless keyboard won’t go into “pairing mode” there is one nifty trick to force it to do so: Power on the keyboard and DO NOT RELEASE the power button. Now complete the pairing process while still pressing the power button.By doing so you will be able to pair the keyboard with the device you want to.

This great tip was found on Dave Meehans Blog.