Mac Pro won't recognize USB devices

Hi all,
My Mac Pro does not seem to recognize cameras (Canon Vixia and GoPro White) or card readers (USB 2.0). When I restart the computer, it recognizes the Vixia, but automatically opens iTunes, where it's not intuittive how to copy just the folder to an external hard drive. Why is this? Is there a fix? I tried running the firmware update, but received an alert that the update was not compatible with my machine.
I'm using a 3.7 GHZ Quad-Core Intel Xeon E5 with 16 GB RAM, running OS 10.9.3.
arice77

I had a similar problem that arose because Apple over-rode the original USB drivers with a kernal extension.
UNloading the extension fixed my problems. Perhaps it will help you.
In a terminal, type this:
sudo kextunload -b com.apple.driver.AppleUSBFTDI
If it solves your problem, keep in mind you'll have to do it after every reboot (a good use for command line history.)
If it doesn't, you can put it right back with this:
sudo kextload -b com.apple.driver.AppleUSBFTDI
Hope that helps. I should also warn you that in my experience, 10.9.3's USB performance is terrible.
--Ben

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