Can't find Blutooth in preferences

I bought a new iMac in November 2013 which has a wireless keyboard and mouse, which worked well but won't connect since OS was updated. I've looked in System Preferences and there is no symbol for Blutooth. In System Report / Blutooth it says 'No Information Found'. It's strange because the keyboard and mouse worked fine up to downloading and installing the update (to OSX 10.9.3.)
Does anyone know how I can get the Blutooth up and running again please?

Might be corrupted Bluetooth preferences.
Open the Finder. From the Finder menu bar click Go > Go to Folder
Type or copy paste the following:
/Library/Preferences/com.apple.Bluetooth.plist
Click Go then move the com.apple.Bluetooth.plist file to the Trash.
Restart your Mac.
Then "pair" the keyboard and house >  Bluetooth Quick Assist

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