Apple USB keyboard is not being recognized with my iMac, what do I do?

When I startup my computer I am prompted with the 'there isn't a keyboard connected' message. I'm using an apple wired USB keyboard, it was working perfectly fine yesterday and it appears to still be operational as I can charge my iPhone from it.
I've tried restarting, using different ports, removing other USB devices, but haven't had any luck. I can only access my guest account as my main is password protected.
I don't know what to do, can someone please help?
Thanks

belle_south wrote.
            I've never discovered why my bluetooth and wifi
            turn on by themselves. I suspect sometimes that
            the cats have something to do with it.
Ha Ha Ha

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Oh I know there are many other vocabulary mistakes but never mind them I was just too excited when I wrote all of that while typing very quickly
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Hi everyone,
hope someone can help me to solve my problem. I have a MPB13 retina late 2013 since something like 3 months. I have additional screen (dell), usb wired keyboard (apple) and BT magic mouse.
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Apple USB keyboard does not work

I have the same problem as described by Sweboss on November 15th, 2012. The Apple USB keyboard is working perfectly, but if I shut down the computer, when I switch it on again, the USB keyboard does not respond, and the computer is looking for a Bluetooth keyboard (which I had before). I have tried switching off, unplugging all peripherals, then unplugging the computer, waiting 15 seconds, then plug it in, wait 5 seconds (this is a remedy proposed in other mails). Switch on and the USB keyboard does not respond. It is not that particular USB port, as it works perfectly well with other peripherals like my scanner, or printer, and changing ports does not help. And when I tried it last time, I had no other USB peripherals connected. Can anyone help?

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For "Cant mount iPod" - please try the following first
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http://www.apple.com/support/ipod/five_rs/
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http://docs.info.apple.com/article.html?artnum=93651
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Several things could keep iPod from appearing in iTunes or in the Desktop/Finder when you connect it to your PC/Mac. The most likely causes are listed below in logical order. Check from the top of the list to see if that is what's keeping iPod from appearing.
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There are also some cases being reported that some unrecognized iPod being able to be erased with Linux, then reconnect the iPod with the original computer and do a Restore there.
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http://www.kokopellimusic.us/KM_instructions.htm

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fixed

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I have a mac mini 10.5.6 (1.83 GHz Intel Core 2 Duo) and I run the Time Machine function to an external usb hard drive. The hard drive worked fine (plugged into the usb port on an older keyboard), but I went out and bought a new aluminum apple keyboard (because they look so cool ^_^ ) - I plugged the external usb drive into the keyboard and it wasn't recognized, so I tried plugging the external drive directly into the mac mini, but it is still not recognized. It is not showing up in Disk Utility or in System Profiler
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Dr. E

Apple USB keyboard is not being recognized with my iMac, what do I do?

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