500 GB Hard Disk will not mount on iMacs (after working fine for months)

setup : 2x iMac 24" 10.5.6..wired to airport Xtreme, Iomega 500 GB HD connected via USB
this drive worked fine and has all the pics on it and was used to backup both iMac's via Time Machine.
Today the Airport Xtreme (AX) gives us a flashing orange light and informs us that the 500 GB Iomega disk needs to be connected to the mac and needs to be repaired.
so...we did, with a "disk appears to be OK " message after 'repair'
mounting from within Disk Utility gives us : "The disk “500HD” could not be mounted.
Try running First Aid on the disk and then retry mounting."
(we did just that...!)
We also tried "Drive Genius" with the same results.
whether we hook the drive to the AX or directly to the iMac...no mounting.
The drive (and it's partition) does appear perfectly in both 'Disk Utility' and in 'Drive Genius'
(The iMac does mount other USB items like mem-sticks, camera's just fine.)

While it doesn't sound like this is really the problem since OTHER devices work on the USB ports, never the less, it is an easy thing to try out anyway.
First thing to do is reset the USB chip set on the mother board. Unfortunately, when you power down the computer there is always a bit of power still applied to the motherboard to keep things alive and this usually includes powering the ports to do stuff like detect when a device is plugged in or wants to wake up the computer. The downside of this is when a bus/port chipset goes into a weird state, locks up, etc., simply power cycling (shutdown & restart) the computer won't work.
So first thing to try is resetting the chipset and to do this you have to power down the computer and completely unplug the computer from the wall power (unplug the power cord to your Mac). Also unplug everything from the Mac's ports (USB, FW, Ethernet, etc.) to make sure no parasitic power is still there to keep the chipset alive. Now let it sit for a minute (give those big power caps in there time to discharge). Now reattach the keyboard & mouse only, plug the power cord back in, & start up the Mac. Now see if your USB ports work any better.
Best of luck!
Patrick
What to do if your computer won't recognize a FireWire or USB device
http://support.apple.com/kb/HT1317?viewlocale=en_US

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