The best way to test that function is to get a hold of an auxiliary (separate USB Keyboard) and plug that into the computer's USB Port. If you have the same problem with an external keyboard, the problem is within the computer and/or Operating system. If the external keyboard functions OK, the board on the computer needs replacing. Last: Some functions are controlled by the BIOs of the Computer and need upgrading from the manufacture.
Might need cleaning under the key pad,
did it get wet at anytime?
could just be keys sticking.
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