Bluetooth on my iMac has suddenly stopped working! no icon and not in the preferences anymore? tried turning off etc. can anyone help?

Bluetooth on my iMac has suddenly stopped working, no icon top right and unavailable in preferences! Tried turning off etc
Help!! Thanks

Please carefuly read and methodically follow the instructions in Apple's Troubleshooting wireless mouse and keyboard issues located by clicking  http://support.apple.com/kb/ts3048

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