My keyboard has lost all functionality after I plugged in my Sony Ericsson Walkman cell phone into a usb port on my computer.  I have reset the image of my computer to that of an earlier time, and have since been able to plug in a usb keyboard and have that work, but the laptop keyboard is still non-functional.  Is there any kind of software glitch that could have occurred when I plugged in the cell phone?   Thanks!

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