After Mojave on Macbook Pro, no keyboard/mouse

Updated to Mojave yesterday on my Macbook Pro (early 2015 model). Used it lightly and then went to bed.

When I woke up this morning, I could not login because the keyboard and mouse did not work. Powered off and powered on and they worked for a few minutes...and then froze again. Since then, regardless of reboot, the keyboard and mouse won't work.

When I plug in a USB keyboard and mouse, the external keyboard and mouse work fine, but not the onboard.

I'm baffled. Any ideas!?