I have an iMac, and cleaned my keyboard with powering off, and now my arrow buttons and rating bracket buttons are not working with lightroom anymore.
I recently spilled coffee over my (Microsoft) keyboard. (a mortal sin for computer geeks!)
With fear and trepidation, I removed all screws and dis-assembled to clean and dry all components.
All the circuit 'boards' are very delicate, so extra care was needed.
I would think your choices are- have it cleaned professionally, or buy a new one.
It is a 'hardware' problem, not Lightroom.
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