Wireless keyboard doesn't connect on startup under leopard and alum imac

The white apple wireless keyboard worked just fine via bluetooth with my old Mac mini and 10.4.X
But just got a new Alum 20" imac with 10.5.6. I have paired the wireless keyboard via bluetooth and it does work once I'm up and running.
But every time I start up the computer after a shut-down or restart, the imac searches for the apple bluetooth keyboard and never finds it. I have to plug the wired keyboard to the mac to start it and then re-do the bluetooth pairing EVERTY TIME. Then the white wireless keyboard works via bluetooth again. I have changed the batteries on the keyboard and checked their strength- they are fine.
What's going on? How do I fix this? Does the white wireless keyboard work with the new imacs and Leopard?

Dodie,
There's nothing wrong with your bt keyboard since it was working fine with your old mac mini. Try this:
1. Backup the IOBluetoothFamily and IOBluetoothHIDDriver kexts in /System/Library/Extensions in your new imac.
2. Copy the same kexts from 10.4.x. In my case, I upgraded to Leopard using a new hard drive so these files were still on my old Tiger hard drive.
3. Clear your cache. If you not sure how to do this, download Leopard Cache Cleaner and do a 'deep clean'.
4. Restart and pair your bluetooth devices using Bluetooth Setup Assistant. My Apple wireless alum keyboard and wireless MM paired immediately. They continue to paired after I restarted / shutdown.

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Wireless keyboard doesn't connect on startup under leopard and alum imac

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