Macbook Air isn't recognizing USB

Hi, I'm using a Macbook Air.
So I've decided to chang my old PC to this. Importing pictures through USB was fine for the first and second time plugging it. But the third time, I couldnt find the USB device in the Finder. This was a few months back and I still couldnt find the answer to it.
Today I plugged in my camera and it wasnt there in the finder as well but I found out that it is plugged in and i could import pictures through iPhoto. But the problem is, nothing is being recognized through finder, especially the USB. But when I plugged in the iPod, it works through iTunes.
Help me please?
Thanks

I plugged in the iPod yesterday and it still works, right now it doesnt come up in my Finder, but it does come up in the iTunes. I think there's something wrong with the Finder. Please help.

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