Depending on the board you MAY be able to replace the keyboard controller chip.
Find the keyboard controller chip on the motherboard, and examine it. See if it looks damaged in any way. If it is, then it needs to be replaced (either that or the whole motherboard). You may be able to get a new controller chip, but you will have to contact your motherboard's technical support department.
If the controller chip is socketed, check to see if it is fully in the socket. Gently but firmly push down on the chip. You may hear a "crackling" sound when you do this, which is fairly normal. This may resolve the problem.......
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