IMac – Apple USB Keyboard not working on 27″ iMac (Intel Core i7)

imackeyboardusb

I have two similar iMacs (27" – i7 – os10.8.4 ) and use Apple's extended USB keyboards on both of them. After a power outage neither keyboard will work on one iMac (A) although both keyboards work fine on the other iMac (B). I have reset NVRAM and SMC on iMac A but to no avail. I have plugged printers into the USB ports and they seem to work fine. As it stands, the only way I can log in on iMac A is by using a Bluetooth keyboard, the USB port however remains "invisible"…

Thank you for your help.

Best Answer

Sorry this isn't really an answer but I can't post a photo in a comment.

I have a 27" iMac i7 as well, when I connect a Key Board/Mouse and an iPhone via USB in "System Information" I see this:

enter image description here

What do you see?

Note that the two USB ports are on different busses. Have you tried both of them? You mentioned that bluetooth works; do the other USB functions work (Card Reader, iSight Cam)?

Related Question