Both my usb ports aren't working, Please help!

I bought a 500gb external hard drive that is usb powered. it was working fine a week ago but now i get a message saying a device draws to much power, therefore all my usb ports aren't working for anything any more. Not even a simple wireless mouse. I am using a macbook pro late 2011. also.....when i use the usb port closest to the charging port, the lights on he external hard drive turn on (yet i still get the message). When i use the other usb port, no lights turn on at all. does this mean one of them is just ruined completley??.
Thanks,

It actually did. After I uninstalled java and restarted my computer for the fifth time, the usb ports actually responded! I re installed java and the problem was fixed.

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    http://
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