Dual Core Intel iMac 10.5.5 suddenly sees no firewire video decks

We have 7 iMacs used in a general area for students to digitize. This week NONE of them will see any sort of video deck or camera through the firewire port.
I did repair permissions, unplugged everything for 10 minutes (including power), zapped the pram. They do not see a DSR-11 or JVC BR-50 deck nor a DVX100, AG-DV60 camera.(this is in either iMovie or FCP 6.0.5 and yes, I tried replacing firewire cables)
I could see one having a problem, but 7 all at once? We are just back from break and did the 10.5.5 upgrade before we left fir Christmas. (We also did this to 18 G5 Intel power macs and they seem to be fine.)
Any thoughts here folks? This definitely seems to be in the software somewhere, either with quicktime or Leopard since neither iMovie or FCP will recognize anything.

Do you happen to have any other firewire devices on these iMacs? Even FW800? Although rarely mentioned, I have seen several Intel iMacs that would turn a deaf ear to DV devices when external drives were also attached simultaneously. Often removing the external drive(s) would resolve the issue, sometimes a reboot was also required.
I have heard that a firewire hub in series may help to resolve the issue, and that it may be related to a timing or power problem on the firewire controller chip in these iMacs. I had also read it may lie in the DV drivers, because someone who booted his iMac into XP had no issues capturing to Premiere or Vegas!
Since the FW 400 and 800 connectors are both driven from this same bus chip, I have to do camcorder captures to the internal drive, then copy them to FW800 raid once the camera is unplugged.
I have been very frustrated by this in the year I've had this iMac, since I bought it to run FCP. Doing video you always need more storage space, and this is quite a limitation... I haven't tried 10.4.x to see if that resolves it; if Snow Leopard corrects it I will be the first to buy it!

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Graham Giles wrote:
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No; but then, I've not had occasion to use TDM. I've been using firerwire drives for over 10 years, both FW400 and FW800, with no issues except a bit of instability using a B&W G3 machine.
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• I don't suppose there is anything I can do to 'put back' lost items from a separate Time Machine drive which has an up to date backup on it.
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On the other hand, if the Time Machine volume is rigidly linked to the now-absent OS on the original drive, there may be no way to effectively access the files in the TM archive.
I know that using a cloned drive would work well in this instance.
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GRAPH LEGEND
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Model Name: Mac Pro
Model Identifier: MacPro1,1
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Guess I didn't realize there was a difference. I'll repost.
Message was edited by: Paul Whishaw1

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Dual Core Intel iMac 10.5.5 suddenly sees no firewire video decks

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