Apple Wireless Keyboard doesn't connect to MacMini

Hello,
I have a problem with my wireless keyboard. When I installed my Mac Mini last year together with the Apple Wireless Keyboard and Wireless Mighty Mouse I hadn't any problems.
Once both devices didn't want to work anymore. At first the mouse finished its work. I used another USB Mouse and since that time the mouse works fine than before. The next problem I get with the keyboard. But all I did, wasn't successful. The MacMini doesn't connect to the keyboard.
I tried...:
1.) to use new batteries
2.) to try it with my MacBookPro (it connect without a problem and is afterwards fully functional!)
3.) to use for a short time my old USB-Keyboard
4.) to try once more connecting it over the Bluetooth-Preferences
5.) to delete in the libraries com.apple.bluetooth.plist and then to restart the Mac.
Any ideas?
Thanks
Alex

I reinstalled the OS and simultaneously I downgraded it to 10.5. It seems to work now perfectly again. Also the often occured kernel-panics disappeared.
Alexander

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