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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.

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I presume your question is how can you reconnect the keyboards to the USB port on iMac A? –  Dave Aug 26 '13 at 21:43
    
Yes Dave, that is my issue. Plugged my keyboard(s) into the iMac (A) and it's as if I plugged "nothing" into the USB port, i.e.: the mac does not see it (even checking the USB port status using "About This Mac"/system info)... Strange, as anything else plugged into the same ports does appear, as it should. –  Matteo Hermani Aug 29 '13 at 21:09
    
I have the same problem. iMac 27" i5 OS X 10.8.4 –  Sebastian Semmler Sep 2 '13 at 15:44
3  
Do other USB ports work? –  Kevin Chen Sep 4 '13 at 2:24
    
What if you connect a powered USB hub to the computer, and the keyboard to the hub? –  Kent Sep 5 '13 at 1:12

2 Answers 2

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

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I just got a new iMac with OS 10.8.4 (Snow Leopard) I opted for a USB keyboard and the keyboard stopped working twice now upon restarts.

BUT when I plugged in my old Mac keyboard (which is clunky and encased in a clear plastic like tray) it works fine. My new sleek USB keyboard doesn't.

I feel that all of these problems may be the newer keyboards. The USB plugs even seems wimpier.

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