IMac A1311 does not respond to any keyboard or mouse

Hello,
My iMac A1311 does not respond to any keyboard or mouse.
I can restart it. It starts without a problem, but I can't enter my account password or move the cursor.
I have tried using four different keyboards including the original bluetooth keyboard and mouse, an Apple wired keyboard, a generic wired keyboard and a wireless keyboard. I also tried resetting PRAM as well as NVRAM. I even tried to start it in Target Mode and tried to start it with a start-up disk (The disk remained inside the computer). Unfortunately, it all seems to originate with the same problem. The computer does not recognize the mouse or the keyboard. I believe I could rule out a problem with the USB port since the original keyboard/mouse uses Bluetooth.
Any suggestions would be greatly appreciated.
Thanks in advance...

Is this a wake from sleep problem, or after only after a restart?
If it is a 'wake from sleep' issue then since some point in OS X 10.6.x, through 10.7 and 10.8, some users (me included) seem to have the occasional problem with the Mac being unresponsive to any commands from the keyboard/mouse/trackpad, and the issue seems to be something to do with Bluetooth not fully waking from sleep.
The 'fix' that works for me 100% of the time is to go to System Preferences>Energy Saver and set 'computer sleep' to 'never'.
I keep hoping that an OS software update will come up with a 'proper' fix.

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IMac A1311 does not respond to any keyboard or mouse

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