How do I solve iMac "Bluetooth: Unavailable" problem?

I have a 27-inch, Mid 2011 iMac (OS X Lion 10.7.5) which was provided with a wireless keyboard and mouse. Afer a year of use, I started having intermittent problems with the keyboard becoming disconnected, but the problem usually solved itself after a few seconds. Now, I am not able to use the wireless keyboard and mouse at all. I installed new batteries in both the keyboard and mouse, however, it did not solve the problem. The Bluetooth icon at the top right of the monitor reads "Bluetooth: Unavailable" in light gray lettering. I am currently typing this with a wired keyboard and wired mouse. I cannot find any solutions in the Apple Support section. How can this problem be solved?

Try resetting the SMC.
Barry

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http://www.oracle.com/technetwork/java/javafx/downloads/devpreview-1429449.html
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Any way of finding out how Apple will solve the Aperture / ACR problem?

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This "Open External Editor from Master NEF", versus open from a dynamicaly created version is, I have decided, crucial.
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HT4623 How can I solve the Bluetooth problem I have with Code 28

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Hi helisa,
Thank you for considering Sony Community!
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Hi,
Bluetooth on my 2011 iMac has suddenly stopped working. The squiggly line thru the Blutooth symbol.
I have checked System Preferences and it says 'no information available' under Bluetooth.
I have tried deleting the plist file
I have tried the SMC reset
I have shutdown unplugged everything and unplugged from mains overnight then powered up
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Message was edited by: dhubz

I will post some screen shots later.
I have tried the iTunes username and password but it does not accept these.
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Thank you for your comments so far...screen shots to follow later.

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I will post some screen shots later.
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