24" LED Cinema Display with my MacBook (2008)

I would be so grateful for some assistance and advice ....
Today I received my new 24" LED Cinema Display ... unfortunately, it did not come with any written instructions or directions. I tried to hook it up to my MacBook using the USB connection, but this did nothing to power up the monitor.
I called Apple Support, who advised me that I needed an adapter for a "mini display port" and a "mini dvi". But when I went to the Apple store, I was told that no such adapter existed. The guy at the Apple store said that the new monitors are not compatible with my Macbook ....... but how can this be, when the Cinema Display system requirements list "MacBook" ......?
Is this really true, that I have no recourse? Please someone help me if you can. It would break my heart to pack up this beautiful monitor and send it away.

Click here for a converter. The USB and FireWire ports on the display are there so the display can act as a hub; neither video nor sufficient power is transferred through them.
(47706)

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