Help, sound and brightness keys stopped working

Friends,
after an requested software update (Quicktime, Security..) all the sudden the monitor control keys (brighter/darker) and also the sound keys (louder/quieter) don't work anymore. Any hints how to get them back to work?
Thanks, Alexander

Which update did you do? Earlier this year, a new update from Apple required a delay before some buttons responded. For instance, before, you could press the brightness keys and it would respond instantly. After the update, you had to literally hold it down for a second or two before it responded. It was a way to prevent accidental inputs.
This may not be your problem, especially if you can't do anything at all. But that was something I encountered. Freaked me out. But holding it down made it work. I don't remember the exact issue and posting at this moment.
I do know the number one issue was the eject key. Again, before, if you pressed the eject key, your media would come out right away. After the specific update, you had to hold it down before you could eject anything. (Hold down the button before it would register).

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Help, sound and brightness keys stopped working

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