Upgrade to Snow Leopard.. external HD not working?

Hello Everyone, I'm hoping to get some help here so that I don't have to make a trip to the Genius Bar to figure out what is going on. I have a late 2009 edition MacBook Pro (2.53 GHz Core 2 Duo, 4 GB, 250 GB HD). I finally decided to install Snow Leopard today using the drop in DVD that the store provided me with when I bought the notebook in the summer of 2009 (never felt like taking the time to do the upgrade till today). Well, now that the upgrade is done, I can no longer use my Iomega UltraMax 500 GB external hard drive that I use to backup data with using Time Machine. Every time I plug it in, it shows up for a split second and then I get the red alert box telling me that I did not eject it properly. At first, I panicked that the drive is corrupt, but I plugged it into my old PowerBook that I have sitting around and it works perfectly fine. I can open all the files and everything!
I hope someone here can help me troubleshoot what is going on. Could Snow Leopard have screwed with my USB ports or something?
Thank you in advance!

After this happens, have you tried disconnecting the drive and immediately connecting a different USB device (perhaps a flash drive) to the same port the Iomega drive was using, just to see whether the port is still active or has shut down? The behavior sounds like what one would see if the drive were drawing too much power from the USB port, causing the port to shut down. But ordinarily there is an error message that accompanies the shutdown and explains that it's because of a device drawing too much power. And of course your drive shouldn't be drawing power from the port at all unless its AC power supply is failing — but if its power supply were bad, it wouldn't work with your Powerbook.
It's an odd and puzzling problem, and I have no explanation for it.

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