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<blockquote data-quote="Rod" data-source="post: 1757115" data-attributes="member: 204485">We have two different threads here which may have completely different causes despite effecting the same keys:monstar says in post #17 that Repair Disk works for a short time which would seem to indicate a software issue but has not stated if he has tried an external keyboard.&nbsp; Rather than downgrade the Operating System how about just reinstalling the same OSX.&nbsp; That way all of the existing apps will still be useable.&nbsp; Alternatively running OnyX may repair the problem as Disk Utility is not the best repair tool in the shed.mannyk on the other hand has successfully tried an external keyboard which would seem to indicate a hardware problem.&nbsp; He should definitely try resetting SMC but if that fails there are 3 possible causes and it's difficult to eliminate them without mechanical surgery. 1. the Keyboard is faulty.&nbsp; 2. The connection cable from the keyboard is faulty.&nbsp; 3. The motherboard is damaged.&nbsp; A hardware check would also be advised. see; <a href="https://support.apple.com/en-au/HT201257" target="_blank">https://support.apple.com/en-au/HT201257</a></blockquote>

[QUOTE="Rod, post: 1757115, member: 204485"] We have two different threads here which may have completely different causes despite effecting the same keys: monstar says in post #17 that Repair Disk works for a short time which would seem to indicate a software issue but has not stated if he has tried an external keyboard. Rather than downgrade the Operating System how about just reinstalling the same OSX. That way all of the existing apps will still be useable. Alternatively running OnyX may repair the problem as Disk Utility is not the best repair tool in the shed. mannyk on the other hand has successfully tried an external keyboard which would seem to indicate a hardware problem. He should definitely try resetting SMC but if that fails there are 3 possible causes and it's difficult to eliminate them without mechanical surgery. 1. the Keyboard is faulty. 2. The connection cable from the keyboard is faulty. 3. The motherboard is damaged. A hardware check would also be advised. see; [url]https://support.apple.com/en-au/HT201257[/url] [/QUOTE]

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