2 external hard drives not recognize by system all of a sudden

I have 2 external hard drives, one was used as a backup with Time Machine, the other was all my music storage, including Logic Pro and Ableton files.
This afernoon I was working on my Macbook pro with no problems, system backed up a few times. I was working on a new project in Logic. I saved the file, disconnected hard drive, went to my 2nd computer, an Imac from late 2009, plug the hard drive in, system does not recognize it. I wait a few minutes then unplug the drive, upon doing that I get a message that I've never seen before:
"Because a USB device was drawing too much power from your computer, one or more of your USB devices has been disabled.
To prevent damaging your computer, the USB device drawing too much power has been disabled. Other devices may have also been disabled. When you disconnect the device drawing too much power, your other USB devices will be enabled again."
It's been a few hours, I've disconnected all the devices, I think I figured that one of the drives is faulty. My question is, why is the other hard drive not being recognized, it's not recognized on any of my 3 computers, 2 Macbook Pro's and one imac.
Any help would be greatly appreciated as this is extremely frustrating.

Try this:
Intel-based Macs: Resetting the System Management Controller (SMC)
If it doesn't help, make a "Genius" appointment at an Apple Store to have the machine tested.

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