IMac does not see my external HD...but my MacBook Air does

I have a Toshiba 1TB HD that I partitioned into iMac and PC.  I run my backup on it with no problems.  Then I got a Time Capsule and set it up.  Now my iMac does not see my HD any more. But my Mac Book Air picks it up. You can see the 2 partitions on the MBA.  I also cant see it in my Disk Utilities and "Mount" is not clickable. I tried to use different USB ports as well as different USB cables.

What to do if your computer won't recognize a FireWire or USB device...
If the issue persists, try these steps:
   1. Shut down the computer.
   2. Disconnect all devices and all other cables, except the keyboard and mouse cable(s).
   3. Disconnect the computer from the power outlet and wait for 3 to 5 minutes.
   4. Plug the computer back in and turn it on.
   5. Reconnect the device(s) (one at a time if there is more than one) and test. Test with each port if you have more than one.
http://support.apple.com/kb/HT1317

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