mac wireless keyboard not working after battery change

STEP 1: T urn off wireless keyboard or pull out the wired keyboard in 30 seconds to cut off the power, in case that the keyboard is burnt out. Thus you should stop the penetration as quickly as you can by: When water is spilt on keyboard, it will penetrate along keys and damage circuit. Press and hold Command + Alt / Option + P key + D key until you can hear Mac restart. Reset PRAM/NVRAM to reset hardware settings. Also you can try to log out your Apple account by clicking the Apple logo on the top left, and log in another account to see if the Apple keyboard works again. If they are not paired, or if the above steps won't help, click Set Up Bluetooth Keyboard and have keyboard join your Mac again.Keyboard will join your Mac automatically and it will be on the list of device.Open System Preferences and click Bluetooth to turn on it.Remember to turn on Bluetooth on your Mac and pair it with your keyboard. You'd better prepare a spare battery or a wired keyboard in case that the keyboard runs out of power. The power button is on its right side, and the slot to replace battery is on the left side. Make sure you turn on the keyboard and the battery is full of charge. Plug your keyboard in other USB ports, and plug other devices (like U-disk) to troubleshoot keyboard and USB port. Make sure the keyboard is connected with Mac via USB port firmly. Ways to Fix Apple Wired/Wireless Keyboard Try out the following methods to make keyboard work properly again before you send it to Apple Store for a repair. Whichever the situation is, it is not neccessary to throw away the problematic keyboard of your Mac. Water or drinks (coffee, coke, etc.) split on keyboard by accident.The whole keyboard doesn't work all of a sudden.

Apple has updated keyboard for Macbook Pro, but recently users complain that keyboard doesn't work properly on MacBook Pro/Air or iMac, for example:

Mac wireless keyboard not working after battery change