External hard drives work on tiger but not on leopard. WHY?

My 2 external hard drives worked fine on tiger. I had the backup program and used it every week. Now that I loaded up leopard, I cant see the external hard drives. When I take the drives and plug them to my mac book pro which I have not yet upgraded, they come up fine.
I cant even see them in disk utility
Please help

My external doesn't work either. It seems like it is trying to boot, but doesn't. Meanwhile, the Mac Pro churns and the fan goes into high gear. At that time the screen freezes and the little rainbow wheel just spins. The only way I could get the Mac back was to power down with the power button on the front of the CPU and unplug the external drive. It's just a backup drive but I would like access to it. I'm looking to see if the manufacturer has a patch online, but I'd appreciate any suggestions ion the meantime. I haven't upgraded to Leopard yet on my MacBook Pro, maybe I'll wait a few days... Anyone know what to do?

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