Macbook USB Electricity problem?

Hi.
I have a black macbook and for the last couple of month im working with an external Keyboard and mouse.
The thing is that sometime the keyboard and mouse just stops working. If i play with the Usb when it is connected then it will start working. Seems like there is a problem in the contact of the usb's on my mac...
Is there something that is known?
Thanks

Someone has not properly plugged in and removed the cables from the USB port in the past*:
http://www.macmaps.com/frayguide.html

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