USB drives not working on Macbook Pro

I have an early 2011 Macbook Pro and both USB drives are currently not working. All storage devices work in my other Mac, just not in this one. They do not show up in disk utility or anything. I've attached a screenshot of the system profiler information, because when compared to my other Mac it doesn't show as many USB ports. Please Help, Justin

Hi i'm also having the same problem (Macbook pro late 2011). I have a back-up hard drive that will not connect to my usb either. I have done a PRAM & SMC reboot and neither worked. I read another post that said to erase the usb & retry connecting, but that's not really an option for me as this is the back-up of my entire disk + extra materials (I'm a medical student). I need the data off my hard drive urgently! It was working this morning and now it's not.
Mine does show up in disk utility, but I can't access anything on it. Any help would be appreciated! Thanks!

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