My usb slot won't recognize a usb device

I have 2 usb slots.
Plugged in a flash drive and only 1 of the slots recognizes the flash drive. I don't see the flash drive either on my desktop or in Finder when plugged in to the 2nd of the two slots.
I've done all recent updates.
Have OSX 10.8.5
I tested 3 sandisk flash drives. The slot closer to the monitor won't recognize any of the drives.
I logged out and logged in as another user and again, slot closest to monitor won't recognize any of the flash drives.
I also tested the 3 flash drives on another macbook I have and both slots recognized the flash drives.
Any rec's or ideas to help?
Thanks

I plugged in my iPhone5 and nothing, no connection on this one usb slot. Connecting via the other slot a-okay though.
Unfortunately my applecare plan expired a week ago! Hah, how's that for timing!
I have appt to go in to store.
Thanks

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