Keyboard problem

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A friend has recently acquired a second-hand Compaq M700 laptop. Everything is
fine except for a keyboard quirk.  Hitting the g and h keys results in g5 and
h6 appearing!  Also, apparently with the number 5 and 6 keys.  He's checked the
 underneath of the keys and no dirt or anything there.  Any suggestions as to
what's wrong -- hardware or software?  TIA

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