My USB ports on my macbook haven't been working correctly. Both of the ports find my iPods, wireless mouse and everything else, but not my USB flash drives [things that contains information] . I've looked for them in System Profiler, and my flash drives that I put in appear in it, but I just can't find the drive and open / put stuff in it. Does anyone know how to fix this or how to access my flash drives? They worked on my macbook before and now they don't. thanks in advance.