Does the keys them selves register? What I find odd is if you have replaced the keyboard and the exact same keys are messed up.
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I'm wondering if you by mistake put the old keyboard back in. You see I could see a row or a column of keys failing as that would suggest either the X or Y wire lines had a break.
Yes, you can keep that Windows Keyboard you love so much
But the limits of the CMD as well as the Zero keys doesn't quite make sense. So that leaves us to suspect the logic board has a problem either at the keyboard connector or the traces but even that doesn't make sense! As just like the keyboard its self the lines from the keyboard travel to the logic board where the signals are decoded.
That I have done, everything reacts except command and zero. I tried an external keyboard and that works.
Mac keyboard mapping
At this point I would try replacing the keyboard ribbon cable and if that failed, I guess you'll need to trace out the matrix lines of the keyboard manually then to locate the faulty trace on it. This will take some doing as you'll need to remove the keyboard again to gain access to the pads on the back side to then trace through the ribbon cable and then to the logic board connector. Some where in this pathway you have a broken line.
It still makes no sense as there are other keys that also are supported by the same lines. Which brings me back to the bad key switch of that keyboard.
How to use the Alt key on a Mac keyboard
I didn't replace just the keyboard, but the whole upper case with the keyboard power button etc including the ribbon. Did put in the right case since the old one was Norwegian. It is really weird that the same issue would appear in both keyboards. Then again it could be a weakness in both. I find it strange that the problem would be something on the motherboard which the keyboard connects to.
Since everything from the keys to the ribbon was replaced, I haven't really opened the computer before, so I can't really see that I have damaged something prior to the keys stopped working initially. The last time it was opened was when the motherboard was replaced thru a recall from Apple.
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How the Command and Option Keys Work on a Mac
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Chosen Solution. Use the pop-up menu next to the Option and Command keys to select the action you wish the modifier keys to perform.
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In this example, you want the Option key the Alt key on a Windows keyboard to execute the Command action, and the Command key the Windows key on a Windows keyboard to perform the Option action. Also, if things get a bit mixed up, you can just click the Restore Defaults button to put everything back the way it was. With the modifier keys remapped, you shouldn't have any problems using any Windows keyboard with your Mac.
People new to the Mac but proficient using keyboard shortcuts to speed up their workflow may be a little taken aback by the notation used in the Mac's menu system to indicate when a keyboard shortcut is available. If a keyboard shortcut is available for a menu item, the shortcut will be displayed next to the menu item using the following notation:.