Neither of my usb ports work, any ideas?

i havent been able to get my ports to work for any device, my camera, draw tablet, mouse, etc... it worked once randomly for my camera after i had restarted it, but i havent had any luck since. can anyone help me?

http://docs.info.apple.com/article.html?artnum=2238 Resetting your Mac's PRAM and NVRAM

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