IMac shows firewire hdd as "unknown device"

Hi,
I have an Iomega firewire hdd, that a few months ago worked fine with my powermac. Now I have an iMac Intel and it shows the firewire as "unknown device". I've tried plugging the firewire hdd into two different iBooks and got the same result.
When the firewire hdd in plugged in, its blue light comes on. But I can't hear the hard drive working (though I can't remember if it made a noise when it was working properly).
Unlike another post that was similar to this, I cannot change the jumpers, as it is a closed unit.
Does anyone have any ideas?
Thanks!

hmm, sounds as if either the HD has died/ has a loose connector, or the firewire controller had gone kaput, its not that common but can happen, and seing as you have tried it on 2 other Ibooks and still have unknown device that seems to be the case.
I have had an external enclosure that had firewire and it stopped working but when i took the HD out it worked find, just the box died..
as yours is a sealed unit id hope its still under warrenty
Sorry i couldnt be more helpfull

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