Keyboard and trackpad not working after login (upper case replacement)
Some keys on the keyboard stopped working recently so I decided to replace the upper case with a new one that had a keyboard.
I am able to use both the keyboard and trackpad during login (click on my profile and enter my password) but one it loads, it stops working. I can plug in an external keyboard and mouse and that works without an issue.
I then thought I would reinstall the OS but I can't enter recovery mode either using the external or internal keyboard. I tried to reset the SMC and reset PRAM/NVRAM but nothing changes. Interestingly, I can enter Safe Mode by holding shift during start up but non of the recovering modes seem to work.
The keyboard seems to work as I can type in my password during login so I don't think they sent me a faulty one. The trackpad was working before and again works during login but not after.
I can try and replace the trackpad flex cable in case it got damaged during the upper case replacement but as it works pre login I'm not sure that's the issue. Would also be grateful for advice on how to reinstall the OS without being able to enter recovery mode.
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