My external HD Lacie D2 Quadra will not mount anymore

Hi,
Since a few weeks my two year old Lacie external HD (D2 Quadra) won't mount anymore through FW 400 or 800 on my MacPro both in front and rear connection (Usb is working fine though). I also found out that the same external HD still does mount with FW on my Macbook laptop although both machines are using the same OSX.6.8. Also on MacPro in the system profiler I can't see my FW external device. Restarting and refreshinging PRam didn't bring any solution yet. I've also updated the firmware of the HD to the latest version.
Does anyone recognize this problem?
Greetz
Rob

Well I now believe that my whole FW conection is corrupt. I tried different cables and connection through different FW ports (also some in my monitor) and no device corresponds or mounts. In the system profiler I get the message that FW devices can't be displayed. I have other devices that also connects with FW but none of these mount either on my MacPro. I tried several things now such as unplugging all the cables and then slowly building it up and begin to suspect that my FW is done on this machine. It's a pity that you can't test the functioning somehow other than it's not working.

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bj10au wrote:
Since upgrading to Mountain Lion, two external USB2 drives that I have will not mount and cannot be viewed in the Finder. The same occurs on a 2012 MacBook Air, a 2009 iMac 27 and a 2010 MacMini, all running OS X Mountain Lion version 10.8.2.
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Both drives show up in Disk Utility, but when attempt to mount the drives I get the message "The disk could not be mounted. Try running First Aid on the disk and retry mounting." I can run Repair in First Aid on the disk and get the message that the volume appears OK, but again have the same problem when I attempt to mount the disk.
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You can start here
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