how do I format a 4GB card that my camera can't read?

in Genius Bar edited January 2014
I plugged my 4gb SD card that I just bought into my SD card reader and than into my computer but nothing happened. I know that my card reader works because i use it with my 2GB card. I suspect that I might have an older SD card reader that will not read such a high card.

But, if someone thinks that this is not the case, and they know of a way to format an SD card using a Mac ( i own a Power PC G5 tower), I would love to hear it. My kodak easyshare C340 sure isn't up to the task of formatting, but once it is formatted, i believe it will work in it. Thanks everyone!
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