How to fix keyboard problem in mac. The keys which are not working are u, j, and m. When I press them random characters appears and something there is no response on the screen. If the keyboard is not functioning well then all keys must face issue. The issue lies with only 3 keys and some at the left side. I had rebooted the system a number of time but still the issue is on the system. What can I do to get rid of this issue entirely. Thanks.
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