Found a possible solution from [Android Central questions][1] give it a shot.

They say do the following

When pairing the keyboard with your device, it will prompt you to enter a pin and say "try 0000 or 1234." You need to:<br><br>
Step 1) enter "0000" on your android device (tablet or phone keyboard)<br>
Step 2) hit "okay"<br>
Step 3) type "0000" and hit enter on your BLUETOOTH keyboard


  [1]: http://forums.androidcentral.com/t-inspire-4g/81161-i-cant-pair-bluetooth-keyboard.html