My WD My Passport SE USB 3.0 works with MacBook Pro but NOT new iMAC?

The drive works fine on my MacBook and I can see it from the iMAC when I share it. but the iMac will not recognise it, nothing in Disk Utility, when plugged directly in.
WD are unable to help as I don't believe there is a USB 3.0 Y cable in the UK and the latest firmware, which supposedly fixes a 'read with Lion OS' issue, does not make a difference.
Any helps????
Thanks
Paul

I've done dwb's suggestion #3, removing the perfectly good WD bare drive from their perfectly bad enclosures and installing it in an enclosure from Other World Computing. Their enclosures always work; "name-brand" enclosures seem to be very troublesome.
The cheapest option after resetting the PRAM/NVRAM is to get a powered USB2 hub as in dwb's #2. The Passport must get all power from the computer's USB port and, if you have a lot of USB devices attached, there may not be enough power left to turn the drive. A powered USB hub has an independent power supply so devices attached to it are not competing for power.
Although I've not tried it, there are positive reports that using Disk Utility to reformat the drive for Macintosh (they are formatted for Windoze when they ship) made the drive behave without resorting to an enclosure or a powered hub.

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