External keyboard no longer works

After a few hours of update for Sierra.

Razer blackwidow... my razer mouse works fine.

Tried everything: restart, reinstall synapse, disconnect/reconnect. Sometimes, it works in a field to enter a password and then no more.

Extremely annoying and I can't use my external monitor thanks to this question now.

Same problem here. Logitech K400 more and Microsoft Wireless Keyboard 2000. It seems that it doesn't recognize keyboard properly, does not answer A, H and I traded, down left / is §... Looks like a bug in the system.

Tags: Mac OS & System Software

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    Thanks for posting in the Microsoft Community.

    Rest assured that we would do our best to help you.

    This problem can result from a software conflict drivers obsolete or third parties with the drivers.

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