Bluetooth not available after upgrading to Mountain Lion

Mine is a mid-2011 iMac. I tried all the ways listed in https://discussions.apple.com/message/4874277?messageID=4874277#4874277?messageI D=4874277 but with no luck.
Anyone experienced similar issue with a solution?
Thanks.
Wenbin

Yes, I'm having the exact same problem.
1. Bluetooth not available from the menu option "Bluetooth: Not Available"
2. Yet, my Bluetooth Apple Magic Mouse works as a basic mouse
3. None of my gestures on magic mouse work (scrolling, swiping, etc.)
4. My Apple Bluetooth wireless keyboard works, but the iTunes control from F7 to F12 no longer work as the pictures imply (e.g. F12 should be volume increase, but it goes to Dashboard)
Reboot doesn't fix it. Haven't try safe mode.
APPLE, PLEASE HELP.

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I tried the SMC option for my Mac (version details below)...but this still didn't solve my problem.
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Model Identifier:
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Processor Name:
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Processor Speed:
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Number of Processors:
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You went wrong at the very beginning by not erasing the hard drive of a used computer before starting to use it yourself. I suggest you do that now.
Back up all data to at least two different storage devices.
Boot into Recovery (command-R at startup), launch Disk Utility, and erase the startup volume. This operation will destroy all data on the volume, so you had be better be sure of your backups. Install OS X. If your Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade, so make a note of those before you begin.
When you reboot, you'll be prompted to go through the initial setup process. That’s when you transfer the data from one of your backups. For a walkthrough, see here:
Using Setup Assistant
Don't transfer the Guest account, if it was enabled on the old system.
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Does anybody know how to get my trackpad working again after upgrading to Mountain Lion?
I recently upgraded my MacBook (13-inch, Late 2009, Intel Core 2 Duo) from Snow Leopard to Mountain Lion. Everything seems to have gone well, except for trackpad behavior.
The primary problem is that the physical click of the trackpad is now erratic. Sometimes a physical click will work, and other times it will not work.
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