You can change a battery and reconnect the keyboard to your Mac. Therefore, your keyboard reacts slowly when you hit a key or even doesn't respond. That is the battery on your wireless Apple keyboard has insufficient power. Check the battery on your wireless keyboard And then, check if your Mac goes work now. You can use a professional keyboard cleaning tool to clean up your keyboard. Maybe you have used your keyboard for a long time and the dust and dirt are scattered in the keyboard crevices, leading to your MacBook Pro keyboard not working. If your keyboard shows up in the devices list in Bluetooth, disconnect it by clicking the close icon beside the keyboard and then pair it to your Mac again. If your wireless keyboard can't be detected by Bluetooth, you can turn the Bluetooth off and then on. Go to the Apple menu > System Preferences > Bluetooth. If you have a wireless keyboard, you should check the Bluetooth connection. If not, your USB keyboard may have hardware issues, you can change a new one. Also, you can connect the USB cable to another Mac to check if works well. If the keyboard still has no response, change a USB cable. If you use a USB keyboard, you can replug your wired keyboard to another USB port on your Mac. When all the keys on the keyboard are not working, the prior thing you need to do is to check the connections between your keyboard and Mac computer.
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