Change of keyboard USB external Apple connected to the Macbook Pro

Dear ladies and gentlemen,

I need your help. I have a MacBook Pro running the last Sierra 17 "MacOS. I bought a 27 "Thunderbolt display and wanted to use a full external keyboard USB Apple (with the help of the digital keys). I have connected to the screen "USB port, closed down the internal screen MacBook... magic happened... keyboard poped office to the top of the screen external AND external full resolution was working properly..." Unfortunately only for 1-2 minutes, then the layout changed back irreversible in a layout resembling the layout if I would press "alt". Only way I could "resolve" to disconnect the keyboard USB plug and then plug again... but after 1-2 minutes did the same thing...

I tried to plug the USB plug into the MacBook Pro directly, but the same thing happened...

I am so unhappy that I can't use correctly the full length external Apple keyboard, large... Any hint/resolution?

Thank you for your help in advance,

Péter

System Preferences > keyboard > Input Sources > [√] see Input menu in the menu bar

... then the menu icon before, choose «Show Keyboard Viewer»

Now, look at the chart of the keyboard that appears on the screen. If the Alt/Option key is stuck, the key will be gray, as if it is held down. If you press it again, he himself is not?

Tags: Notebooks

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