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Apple Keyboard A1048 recognized,usb hub works, keyboard not responsive

Just got a second hand Apple Keyboard A1048.

After cleaning it’s not working. Tried resetting SMC and restarting my Mac. The USB works and gets recognized.

What can I do?

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What do you mean the USB works? Does the Key Caps LED lit when you press it?

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The caps lock doesn't light up. but the USB hub on the keyboard works. Also the keyboard shows up when I go to system preferences -> keyboard -> modifier keys.

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