Mouse bluetooth disappeared

Bluethooth for mouse disappeared.  Re-booting does not help.  I can't go back and get it from time machine because it is a OS file.  When you go to the utility, it says "no hardware found".  Mouse worked just fine yesterday.    I tried fresh batteries.  Even tried a different mouse.  It is like the machine completely ate the bluetooth software.  *Poof*  Gone.

Hello:
Try resetting the SMC:
http://support.apple.com/kb/HT3964
Barry

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