Why is my wired keyboard not working?

Hi All,
Most of the time if I plug my wired keyboard (standard Apple w/numpad) before I start it up it works OK, however if it is unplugged whilst it is on, then plugged back in again it won't be recognised. Other non wired keyboards are fine. Even if I shut-down the MacBook Air ('13), plug the keybaord back in, then start up, it does not work. What's weird is that it normallys resets itself by the next working day (I only use the keyboard at work, take my Mac home).
Any help would be greatly appreciated, I miss having the two extra USB's!
Cheers,
Nathan

Good Morning SwimmingNathan,
If you are having issues with your wired keyboard, try a different USB port.  Then try resetting the System Management Controller (SMC) and PRAM.  Here's how:
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/ht3964
About NVRAM and PRAM
http://support.apple.com/kb/HT1379
If you tried all of these steps and your issue persists, contact Apple technical support or take your keyboard to the nearest Apple Store or Apple Authorized Service Provider (AASP) for diagnosis. If you plan to visit an Apple Retail Store, make a reservation at the Genius Bar using http://www.apple.com/retail/geniusbar/ (available in some countries only).
Cheers,
- Judy

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