Macbook no longer seeing external hard drive

I have an Intel Macbook running 10.6.7.  Yesterday I had two USB devices plugged in, one of them being my external hard drive.  I started to unplug the hard drive by accident and quickly plugged it back in.  However, I think this has now resulted in my Macbook no longer recognizing that device.  I have turned the computer off with the device unplugged then turned it back on and plugged it in again, but it still doesn't see that drive.  I've also tried changing ports, which didn't help, and the computer is able to see other devices using both ports.  Any help?

Unplugging the hard drive itself from its power source (it's one that needs to be plugged into a wall outlet) solved the issue.

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