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if the unit has the original hard drives inside (i never one with 10 000 rpm drives though), the problem might be caused by a power issue.
Please verify the power supply by plugging it into the wall then listening to it. It should be silent. If there is a high pitch noise or hissing, it is defective and needs to be replaced.
If replacing the defective power supply did not solve your issue or if the power supply did not have any issue at all, the internal components will need to be inspected.
If you replaced the internal drives with 10 000 RPM drives, it might be why the drives do not get enough power.
am not so sure if this is a similar issue with iomega external drive in which the drive wont show up on My Computer but when the external drive was plugged into an ubuntu machine the drive was being detected and working just fine.
Please try to do the same. plug your external drive to an ubuntu machine and lets see if it can be detected. If it is then the hard disk has a similar issue with iomega drives. check this link for the solution.
i'm not sure i can solve this problem--which started for me tonight as well with my lacie d2 quadra 500 gb--but i can share a possible explanation i've found online: apparently, they have lots of problems with their power supplies. see if the power adapter (the black brick) is making a hissing sound, or if there is a ticking sound coming from the drive itself. i have both these sounds. i am hoping all my data is safe and that my i.t dept. will be able to fix it with a new power supply on monday.