Digital Cinema Desktop is black with sound

Hi,
I've been testing some DVCPro HD clips - 720 at 24p - on my G4 Powerbook to see how FCP will perform. Editing operations seems smooth and work fine, but when I try Digital Cinema Desktop Preview, the screen goes black, and I just hear the audio.
Regular DV clips work fine. According to this doc:
http://docs.info.apple.com/article.html?artnum=93797
DVCPro HD should be supported.
I am running FCP 5.04, 10.39, QT 7.1 on a G4 with a FW800 external HD. I have tried all combinations of using the laptop screen with/without an external monitor, with just the external monitor, and sending the DCD output to one or the other - same thing in all cases: black with sound. BTW, "Single frame" works fine, just not "All frames."
Any advice/info is appreciated!
Thanks!
Powerbok G4 15" (FW800) Mac OS X (10.3.9) External FW 800 HD

Hi x, thanks for the response. I don't have access to another Mac with FCP on it yet, but I did go through this: upgraded to 10.4.5 (bought 10.4.3 and then ran the combined update). Same symptoms. Reinstalled QT (yes - I meant .01) to 7.04. Reinstalled FCP. Ran the 7.01 reisntaller. Updated to 7.04 again....
AT each step, I tested the DCD behavior. The same each time... I did this with a regular clip, and also a rendered circle generated in FCP itself (figuring that would be a "pure" file.)
BUT, I found out something: If I set the zoom in the canvas to something higher than "fit to window" (so part of the image is cropped in the canvas) then, a still image shows up on the DCD screen. So, the DCD behavior on my PB is, with DCD on for "all frames", and the canvas set at any setting that lets me see the whole image, playback is black on DCD and frozen in the Canvas. With DCD off, Canvas playback is fine. With DCD on, and Canvas zoomed (or window resized) so part of the image is croppped, both DCD and Canvas freeze or stutter, but DCD is not black. And again, regular SD DV is perfect always.
So, I am thinking that my PB's video card is not up to handling the HD (DVCPro HD 720 24p)using DCD.
Oh well...
Powerbok G4 15" (FW800) Mac OS X (10.3.9) External FW 800 HD

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First thank you for responding. It is nice to know you're not alone in this world when FCP let you down.
I looked at the other post. I don't have the space which you are talking about. It's just the same as your screen shot. No line spaces.
Maybe this additional info will be of any help:
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Jeff,
First thank you for responding. It is nice to know you're not alone in this world when FCP let you down.
I looked at the other post. I don't have the space which you are talking about. It's just the same as your screen shot. No line spaces.
Maybe this additional info will be of any help:
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After I choose continue I never got the message again.
I checked if the /Library/QuickTime/DesktopVideoOut.component was missing. I found out that there is absolutely nothing in the folder /Library/QuickTime/ not the folder which is in the library directly under the root directory of the hard disk nor in the library which is situated under "user/library/QuickTime/
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