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I have a PS/2 multimedia keyboard and everytime my computer shutsdown unexpectedly (i.e power failure) my keyboard turns on numlock while the computer is off. When I start the computer, the numeric keypad doesn't work at all and I can't control numlock state either.

Keys are also pressed randomly while I type something. Nothing works until I unplug and replug the ps/2 connector.

What is causing this? What can be done to fix the issue?

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