Bluetooth suddenly disappeared from my Imac?

One day my wireless bluetooth keyboard stopped working. Thinking it was low on batteries, I changed the them and still nothing. I, then, realized that my bluetooth had stopped working. When i click on the icon on the status bar above, it says "Bluetooth: Not Available". I go to system preferences and the bluetooth icon no longer exists under the subgroup "Internet & Wireless. What gives?
I own an Imac 27" last years model.

Try a PRAM reset:
http://support.apple.com/kb/HT1379

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Bluetooth suddenly disappeared from my Imac?

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