LaCie Quadra 500 GB not recognize ONLY on iMac Alu

Today the LaCie Quadra 500 GB connected via FW800 to an iMac 20" Alu suddenly stopped to be recognized by the system... The drive emitted a strange noise as if it was an old vinile LP...
I know, bad feelings about its safeness... but when I connected it to a PowerMac G5 it was immediately mounted on the desktop and either Disk Utility and Drive Genius have reported the disk is OK, with no software or hardware issues...
Re-connected back to the iMac it isn't still recognized, even if I've changed cable, port and chain position with another LaCie disk.
I've sent a support request to LaCie and I'll wait an answer in the next days, but if anyone could have an idea about this problem, I'll be glad to read it.
Thanks,
Matteo

Macteo,
You're very welcome and I hope we get to the bottom of this.... Here's something to do - with the drive plugged in ( and not responsive) - go into System Profiler ( you can get there via the Apple menu and clicking more info ). What does it say under your Firewire settings? Does the drive show up there? Name of the drive, etc.
I re-read your original posting and noticed it said the drive made a weird noise. Hmmm.. I had a Lacie Big Disk Extreme FW800 drive and it recently died on me. I hope that Lacie technical support are better with you then with me as they we not extremely helpful as my drive was past the standard warranty....
Anyway, get back to us with the System Profiler information and maybe that will shed some additional light on this mystery, Mr. Watson.
Good luck!
Rudy

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