Why my Apple Wireless Keyboard (2007) wont pair with my Imac mid 2011 (MacOS 10.7.4)?

Hi there and thanks in advance for the support.
Now we have an apple wireless keyboard 2007 and an Imac mid 2011 with Mac OS X 10.7.4 that won't connect. We had the keyboard the IMac brought but now it's lost and we need to get our old wireless keyboard to work with it.
It's discoverable (we know this because it blinks and appears on the devices list on the BT setup assistant) but it wont pair or even give us the "enter the passcode" to try. We tried the "do not use a passcode with this device" and then the following comes out "the pairing attempt was unsuccessful. This configuration of Mac OS X and Bluetooth software could be invalid or unsupported."
What can we do? It sounds like you guys in apple development didn't create this connecting option. Is it true?
Buying a new one is no option nor for our pockets neither our moral. Please let us know about solutions.
Gracias

Might be corrupted Bluetooth preferences ...
Open the Finder. From the Finder menu bar click Go > Go to Folder
Type or copy and paste the following:
/Library/Preferences/com.apple.Bluetooth.plist
Click Go then move the com.apple.Bluetooth.plist file to the Trash
Make sure the keyboard has fresh batteries then try pairing the keyboard.
If that didn't help, update your Mac's software to v10.7.5. Open System Preferences > Software Update > Check Now
Restart your Mac after the updates are installed, then try pairing again.

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