IMac Completely Unresponsive

I got to work today to find my iMac completely sluggish.
I restarted my iMac and now upon restart the computer is completely unresponsive.  It won't recognize the wireless mouse (magic mouse).  It won't recognize the usb keyboard.  It won't recognize the usb backup mouse.
Help!!!!

Try to reset the SMC. Follow this guide (Intel-based Macs: Resetting the System Management Controller (SMC)):
Resetting the SMC for Mac Pro, Intel-based iMac, Intel-based Mac mini, or Intel-based Xserve
Shut down the computer.
Unplug the computer's power cord.
Wait fifteen seconds.
Attach the computer's power cord.
Wait five seconds, then press the power button to turn on the computer.

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    You are right . this might be a possible ac adapter or MOBO.. im gonna pm you then
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  • 2011 MacBook Pro 13" Keyboard and trackpad completely unresponsive. Only external devices work. Restarting does nothing.

    Was in the middle of a game and the keyboard and track board became completely unresponsive. Was using an external mouse so I was able to restart the computer but it has done nothing to help. Also closed the screen for a while to no effect.

    Hello Alaskanpro,
    Thanks for using Apple Support Communities.
    For more information on this, take a look at:
    Intel-based Macs: Resetting the System Management Controller (SMC)
    http://support.apple.com/kb/HT3964
    Best of luck,
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  • Intel based imac becomes unresponsive

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    when this happens can you move the cursor?

  • Completely unresponsive iPhone 3g, decides to work 8 hours later

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    HI dunpealer,
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    Check the terms of the warranty which are usually provided as part of the documentation that you receive with the product, otherwise you can find it on the Microsoft web site for your country (warrsnty terms vary according to the laws of the country where the device is sold).
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