Help unmounting USB stick

[Daniel Carrera]

Hello,

I'm having trouble mounting/unmounting my USB stick. This is what happened:

1. I put the USB stick in for the first time. Ubuntu detected it and 
mounted it.
2. When I was finished, I right-clicked and selected "umount". When the 
icon disappeared I took it out.
3. Later I go back and put it back in, and it didn't mount 
automatically. So I sent to System > Computer and I see the icon there, 
as if it was mounted.
4. I right-click on the icon in "Computer" and the option says "Mount", 
so I choose that, and nothing happens.

So now I can't read my USB stick anymore.

Help?

Daniel.
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