No sound anymore - iMac doesn't recognize Firewire HD anymore

Hi there,
For months I have been using Final Cut Express with my external Firewire HD without any problem. I have been working on several projects and FCE always recognized my HD.
Then a few days ago suddenly my audio meters didn't move anymore: no sound at all! It didn't matter which project I opened, they all remained quiet while the video played. All the other applications on my iMac still generate sound.
Strange thing happened when I changed my settings in Easy Setup. I had sound... until I chose another clip. I tried this several times: always had sound until I selected another clip.
After I closed and restarted FCE I got this message:
"External A/V
Unable to locate the following external devices: Apple Firewire PAL (720x576)"
I already knew this message from the times that I had forgotten to activate my Firewire HD before starting FCE, but this time my Firewire HD was definitely on.
My System Profiler recognizes the Firewire HD, but whatever I try I still get the same message from FCE.
I trashed my preferences. I reinstalled FCE. All to no avail.
I don't know what to do anymore, please help.
Thanks in advance!

I figured it out! I already had read the link you mentioned, but when I did read it again after you posted it I began to reflect on third party devices and that lead to the solution.
I have 2 audio interfaces: 1 Emagic A62M and 1 Tascam US-122L. Apparently Final Cut doesn't like the Tascam. You can read more about it here:
http://discussions.apple.com/thread.jspa?messageID=4150185&
I've been using both interfaces for several applications, but I couldn't believe that dead audio meters might be the result of a switch between audio interfaces. Until I stopped being naive and stubborn and just tried going back to the Emagic interface.

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