MBA no longer reads the external drive - can anyone help?

Hi
My MBA no longer reads the external iOmega HD. I use the iOmega to store all my files and for the TimeMachine.
My old Powerbook G4 continues can read it so it's not a problem with the external drive. Also, the MBA can read another external drive that I have. So the problem is specific to this MBA and iOmega drive. I suspect, but am not sure that the problem is due to a recent system update.
Can anyone figure what went wrong?
Thanks.

is the drive's firmware up to date?
is the drive being powered from the usb port? perhaps it is just on the limit of the power the mba can supply, can you try it with an external power supply?

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