One of my USB ports is not working

Hello,
I just found out that one of my USB ports on my MacBook Pro (Early 2011) is not working. I usually use only one USB port to connect my external hard drive but when I wanted to connect my mobile phone and external hard drive at the same time, I noticed that my phone was not detected but it was charging. To confirm that there was someting wrong, I swapped the mobile phone with my external hard drive and what I found out was the indicator light on my external hard drive lights up but it was not detected by the MacBook. The other port works just fine.
Does anybody know what is wrong with the USB port and what should I do?
p/s: I bought my MBP in Malaysia early September and now I am studying in India.

After I went through the Apple Support Community, I tried the easiest and simplest suggestion first: restart my MacBook. Well I did it and the USB port seems to be working again and it reads my pendrive. Hope it will stay that way and never go wrong again. I really don't like going to Apple store because none is nearby.
Thanks for the reply by the way.

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