Problem with keyboard: some keys return two, not one, characters

I have a MacBook Air 11 '' mid-2012 128 GB SSD model running OS X Yosemite 10.10.5 and my keyboard has developed a strange problem occultation key repeat.  Whenever you press the "3" button, the system generates thus simultaneously a '3' and '6 '.  This motif is repeated this diagonal of the keyboard down, i.e.

'3' generates a '3' and '6 '.

'e' generates an 'e' and a 'y '.

"d" generates a "d" and an "h".

'c' generates a 'c' and a "n".

The reverse is also true, that is, a '6' generates a '3' and so on.  Curiously, the sign '=' generates a character "§" as well, a special character generated by keeping down option and pressing "6".

(This combo generates a ' § ' and a ' £', hidden under the '3'.)

The same problem occurs when you use the Shift or Control keys as modifiers.

I can work around the problem by using either a connection wireless Bluetooth or wired USB keyboard (like using the "Keyboard Viewer" option under "System Preferences"), but that kind of defeats the point of having a laptop as a MacBook Air, Yes?  The problem is intermittent, but becomes very annoying.  (Try to type a password with such a mess!) It sounds like a mechanical problem requiring a possible replacement of the sale wholesale (and), but I hope someone out there can have a software or another solution.  Thank you!

Raoul_Duke wrote:

I can work around the problem by using either a wireless or wired USB Bluetooth keyboard

That certainly points to make it a hardware problem.  It is difficult to imagine a software problem that would not affect both internal and external keyboards.

Tags: Mac OS & System Software

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