Bluetooth connection on keyboard not working iMac/macbook

Hi
I've just bought an iMac and have it connected to my macbook air using a thunderbolt connection. Once connected I use cmd f2 to change the iMac screen to the screen on my macbook air. Using the bluetooth settings on the MBA i can connect the wireless mouse (previously connected to the imac) and tried the same for the keyboard. Although I managed to get it to pair yesterday I can't seem to get it to do it again today (guess yesterday was a fluke).
It will connect when the Imac is off or when the keyboard is disconnected on the imac - problem being that I need the keyboard to change the screen over to the MBA.
Any thoughts / something I'm missing?
ps I've got OSX 10.8.3 on imac and 10.7.5 on MAB if it matters - didn't yesterday
L

hi all
by a stroke of luck i worked it out - turns out you have to switch the keyboard off, then when switching it on you have to keep your finger on the power button - the green light will flash until the connection is made.
works now, onlly wasted an hour two trying to get to this point. nevermind

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