Bluetooth just stopped working

turned macbook on and none of my bluetooth devices working. the icon at top states bluetooth unavailable. in system pref. there is no bluetooth pane to open. Worked one minute then nothing the next. any ideas?

Navigate to *Mac HD > Library > Preferences* and delete the "com.apple.Bluetooth.plist" file in there.
Restart the Mac and hopefully your Bluetooth should be back.

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