I have a Macbook Pro 2.3GHz Intel Core i5 running OSX 10.9.5. After my mac went to sleep the built-in keyboard didn't seem to be working properly. It was printing characters like: åß∂ƒ©˙∆˚¬œ∑´®†¥¨ˆøπΩ≈ç√∫˜µ≤≥, which after I checked later look like the normal keyboard characters when holding the options button. I had the options button disabled in the first place.

Things I tried:

  • Keyboard viewer works the exact same way with the built-in keyboard, which makes me think that it may not be a HW issue. I pressing for example button a on the virtual keyboard and I get å.
  • I activated sticky keys to make sure that the option button wasn't stuck or something. It was fine.
  • I plugged a USB keyboard which works fine (phew!).

I was thinking to upgrade to Mavericks and hopefully this will solve the problem but any other ideas or suggestions will be much appreciated.

  • Are you unable to upgrade to Yosemite? – brettfazio Aug 6 '15 at 0:08
  • Is is possible the problem is purely mechanical, and a speck of cruft is shorting out one or both Option key mechanisms below the keycap. You might want to try a blast of pressurized 'air' around both Option keys. Similarly, you might want to try giving each Option key a number of harder-than-usual raps with a finger tip to try to dislodge (and in the case of crumbs) pulverize the offending cruft. – IconDaemon Aug 6 '15 at 0:25
  • Thanks @IconDaemon, I'll try these. brettf, my bad, I was thinking to upgrade to Yosemite not Mavericks (yes there shouldn't be any problem) – Michael Aug 6 '15 at 8:50
  • It is hard to imagine any software issue which would let the usb keyboard work fine when the other does not. Physical damage to the internal keyboard is most likely. – Tom Gewecke Aug 6 '15 at 18:03

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