USB seems to not work properly anymore with Mountain Lion

I just upgraded to Mountain Lion. Tried to transfer pictures from my DSLR camera but it cannot be detected anymore. My external hard disk does not work anymore as well. Can anybody please help? Thanks.

Open System Information (Applications > Utiities) and select the USB entry in the left column. The top right pane will show all the USB busses on your Mac. If the Mac can see the camera and external hard drive then they should be shown under one of the busses. So do you see them? If no, are they connecting directly to the Mac and not via some sort of USB hub?

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