My MacBook won't detect some USB devices. HELP

All boxes are checked under Finder>Preferences>General and Finder>Preferences>Sidebar. It shows up when I go Apple Menu>About This Mac>More Info...>USB but not when I check Disk Utility. HELP!
Also, I have OS X 10.6.8

An issue with USB can be almost anything.  Check this article from Apple, as it might help you diagnose the problem. 

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