Q: Since upgrading to Yosemite, my wired keyboard sometimes won't type

Hi dcfrogs,

I'm sorry to hear you are having this issue since the update. If you continue to have intermittent but persistent issues with your wired keyboard, you may find the troubleshooting and isolation steps outlined in the following article helpful:

One or more keys on the keyboard do not respond - Apple Support

Regards,

- Brenden