Keyboard and trackpad do not work
The keyboard stopped working due to use and I replaced it with a new one. Then the keyboard and trackpad stopped working. But it works with external keyboard and mouse.
Then I installed the operating system Windows 8 and Windows 10. On the Macbook and there the keyboard and trackpad works normally.
Additional information
-> Before changing the keyboard, the battery lasted 10 minutes.
Update (11/24/2022)
Update (11/28/2022)
I was thinking of just buying a new battery but any idea why my keyboard and trackpad are not working?
When I turn on the MacBook and press "Command (⌘)+ R" to boot from the macOS built-in recovery system, the keyboard does work
Ist dies eine gute Frage?
Well your battery is in trouble! What could be happening is the battery has swelled so it’s pressing on the keyboard messing it up.
So why does the internal keyboard still work when during boot-up? As I tried to explain why MS Windows works, yet macOS once booted up fails. This gets into the driver load. When you boot-up you are using the systems firmware keyboard driver which like MS Windows uses the USB driver directly into the PCH, but once the macOS is loaded the OS driver is then used which uses the SPI interface into the PCH.
So why did Apple use the SPI interface? This gets into the different languages the keyboard supports concurrently! As an example I have US as my primary and I have Japanese keyboards as well so I can jump between them.
Anyways… here’s the needed part MacBook Pro 13" Unibody (Mid 2009-Mid 2012) Battery and the guide MacBook Pro (13 Zoll, Ende 2011, Unibody) Akku tauschen
von Dan