Solved! SOME keys not working after laptop keyboard replacement

May 9, 2020
HP Probook 455 G3

Various keys on the board weren’t working so I replaced the integrated keyboard entirely. With a brand new keyboard, the same keys still don’t work, though as before SOME do.

I have updated and reinstalled the keyboard drivers AND the synaptics driver to no avail. The computer itself is up to date. The keyboard and all its connections are clean.

EDIT: External keyboard plugged in/connected by BT works just fine. Also, the computer itself is not infected with any malware or viruses.

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Could be the connection on the motherboard is bad, or the keyboard was not plugged in all the way.

Did you test the keyboard in Safe Mode or using a Linux Boot disk to rule out any issues with software?