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Old 12-30-2012
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Try this to potentially fix the USB not recognized problem:

Shut down your computer

Unplug ALL devices from the computer (power supply, usb, everything)

Wait about 30 seconds after everything has been unplugged from the computer.

Remove your power supply from the wall if there is one and wait a moment before plugging it in. Now plug it in and plug in only the components that you need to your computer, e.g. keyboard and mouse.

Now try starting up the machine. Oddly enough, this frequently works to solve most problems like this one.
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