Optiplex error code 8602

the keyboard is unresponsve, have unplugged and reseat, I can only access th F2 key, pc will keyboard boot, but nothing else, even changed keyboard and mouse, pc still same. HELP!!!
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More about optiplex error code 8602
  1. Are you using a USB or PS2 keyboard? If USB, did you try other USB ports, including those on the front of the system?
  2. Try a different keyboard. It looks like you have a bad keyboard.

    I had a similar problem, and the cause was a loose connection to my USB hub. Unplugged and replugged it and it was ok.
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