Keyboard does not work after logging in

1) Try booting into Safe mode

http://support.apple.com/kb/ht1564

This will not load any 3rd party additions, it will load some more conservative Apple drivers (may cause screen flicker), and it will clear some kernel caches (a cache is saved data in a form that can speed up a program, but is totally redundant to the original source, and thus can be safely cleared).  Booting into Safe mode is just an experiment, but can frequently eliminate any 3rd party interference, or a cached item out-of-sync with the world.  (Verify Safe mode via Applications -> Utilities -> System Information -> Software -> Boot Mode -> Safe vs Normal)

If the problem does not occur in Safe mode, then it is very likely 3rd party software you have installed.

2) Please post the EtreCheck output as a "Reply" to this thread (you can use the FREE mode)

<https://itunes.apple.com/app/etrecheck/id1423715984?ls=1&mt=12>

Click on the Share icon and select "Copy Report"

And then Paste the report as a "Reply" to this thread using an "Additional Text" box.

EtreCheck is a tool that helps Apple Support Community volunteers debug problems without any access to the troubled computers. Debugging problems can be a difficult task even when the machine is in front of you. Attempting it via a discussion forum is extremely difficult. EtreCheck is a great help that regards.

3) You should also try an SMC reset and an NVRAM reset (this may just be a placebo, but it will not hurt either)

Reset the System Management Controller (SMC) on your Mac - Apple Support

https://support.apple.com/en-us/HT201295

How to reset NVRAM on your Mac - Apple Support

https://support.apple.com/en-us/HT204063

Jan Voortwist wrote:

Every one out of 15-20 startups I experience strange behaviour on my early 2015 MacBook Pro running 10.14.6. But this problem already occurs back in the day when I still had 10.13.

When it happens, I can type in my password and log in. Right after that, the keyboard on my MacBook as well as my Apple external USB keyboard stop working. Every time I push a button (on the MacBook and external keyboard either), the standard OSX sound is being played what you normally would hear when you try to type when there isn't a text field selected. Further than that there is no error message what so ever.

So I'm guessing it is not a hardware malfunction, but a software one. I've tried disconnecting my USB keyboard and reconnecting, but no success there.

When it happens, both the trackpad and my bluetooth trackpad are working perfectly, so I can restart. Most of the times the problem is gone after restart but on rare occasions I have to reboot twice.

Like I said this problem occurs every once in about 20 starts, so not very often. The other times my MacBook and keyboard input works perfectly.

It happens while charging but also during working on battery. It also happens with or without an external monitor/keyboard/trackpad.

Anybody has an idea on how to fix this?

This seems an odd occurrence, following from 10.13 to 10.14.6

Are you running any Anti-Virus, Cleaners, speeder uppers of any sort?

To get a good look at your System config. for conflicts or issues, you can download/run this trusted utility https://etrecheck.com

If you need help interpreting the report you can post it here in its entirety in the "Additional Text" box in the editing toolbar below, in your reply.



You can set its preference to "Allow full Disk Access", with this you get a digest of issues from the last 7 days that are saved in your system. _No_ personal information is revealed.

A properly functioning drive should complete in ~ 3 minutes. Marginal blocks that must be re-read multiple times in order to get good data will add extra run-time.