USB keyboard recognized only after restarting.

Everytime I connect my USB keyboard to my rMBP I have to restart OS X to make it work. How can I make my MacBook recognize my USB keyboard without restarting?

Morning Persian Apple,
Thanks for using Apple Support Communities.
The System Management Controller (SMC) is responsible for many low-level functions on Intel-based Macs.
For more information on this, take a look at this article:
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/ht3964
Best of luck,
Mario

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    http://support.apple.com/kb/HT3964
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