After Update on Mountain Lion my Bluetooth is not working

Hello,
after I updated my iMac from Snow Leopard nach Mountain Lion 10.8.2 my Bluetooth is not working. Also my Magic Mouse works not correct. The scroll function is not available. What can I do?

Leibe AndreSch...I have encountered the same problem with Mountain Lion 10.8.2
Especially after 'sleep' mode the bluetooth keyboard and mouse are lost and although I keep an old wired mouse
handy for such problems....I can't access the Bluetooth settings to sort things.....the spinning ball nonstop.
What I do is...Force shutdown by holding power button for two seconds...When shutdown PULL power cord out from rear of iMac....wait 5 seconds.. replace and switch iMac on again.
As long as bluetooths ar 'discoverable' it restores connection.
We will both look forward to another Apple iMac software update to sort this glitch....or I HOPE so

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