key board light not detected by one system works ok on the other

The PS/2 key board supplied by Compaq was well till recently when it stopped working on the Compaq system. I tried to re-install the KB but failed as it was not detected. I switched the KB of my other system(Compaq brand) and both are working fine. I am surprised as to what has gone wrong and what is the resolution? Can any body help?
Anil Chopra
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More about board light detected system works other
  1. device manager

    fid the entry for the keyboard

    uninstall it

    reboot with the keyboard plugged in
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