Air's left usb doesn't work!

When I use usb mouse or removable disk, nothing happened on my air or on my plants. But when I insert my ipod to the left usb, itunes told me I have used usb 1.1.
By the way, the right usb is all right.
thanks~

Thanks for your answer. I think perhaps the problem is associated with software because air can recognize my ipod. I wanna know if I go to AASP, does it cost a lot of time?
Difficult question to answer. Let see if you have been doing the SMC reset correctly, I'd also recommend doing a PRAM reset. The reason I bring up the SMC is each Mac model has a different sequence. Here is the correct process for a MBA.
SMC RESET
Shut down the computer.
Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
Release all the keys and the power button at the same time.
Press the power button to turn on the computer. 
PRAM RESET
Shut down the computer.
Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step
Turn on the computer.
Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.

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