No Firewire 800 after upgrade to 10.7.4

Hi All
I have a mid-2007 iMac (upgraded to 4GB RAM and 2TB HD). I have a Freecom Quattro Dock which allows me to hot swap hard disks, and it's connected to my iMac via Firewire 800. I use it to backup my internal HD.
I backed up my iMac HD and then proceeded to upgrade from 10.7.3 to 10.7.4 which appeared successful, but now my iMac cannot see the disk connected to the dock via the Firewire 800 port. The dock has USB 2 and Firewire 400 connections, and it works fine via Firewire 400.
Has anyone else experienced a similar problem? Does anyone have any ideas?
Thanks in advance
Paul

That's why I mentioned both. Sometimes installers muck up low-level settings.

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shaneeudy wrote:
So guess my question is this: Are there any know problems with using Firewire 800 with Time Machine?
Hi, and welcome to the forums.
Not in general. Some drives don't always wake or "spin up" fast enough; often that's seen when the system wakes from sleep, though, not so much after a system Restart. Many Western Digitals do that; I don't recall seeing any posts here about yours, but you might want to search the forums for Fantom
In the meantime I'm trying another experiment - I've disconnect the Firewire 800 connection and replaced it with USB.
Good plan - that may provide a clue.
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I experienced a strange event and would like to share it with you for feedback and comments.
During several days the external hard disk connected to the Firewire 800 port of my IMAC caused me increasingly problems, and eventually the disk would not mount at all on the desktop. I connected the disk to the FW800 port of my portable and the disk worked quite fine. I concluded that the FW800 port of the IMAC was damaged. I was preparing myself to contact Apple to get the IMAC repaired.
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This link is to an image in which you can see my Fw settings in System Profiler.
http://i39.tinypic.com/105dz4y.png
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Sorry little addition:
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