Mac won't recognize when usb is plugged in

I'm new to Mac but I can't figure out why it won't recognize when I plug in something via USB. I have tried using both my printer and iPod/iPhone. I have looked under applications and then utilities in finder and under devices it isn't there. What am I doing wrong/how do I fix this?

When you connect an external device to your MBP, an icon should appear on your desk top.  Since your printer and your iPod use different USB cables, it does point to a problem resident in the MBP.  It seems to me that a visit to a Genius Bar at the Apple store is in order.
Ciao.

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