Weird video preview problem... frustrating!

Hi, I wonder if anyone else has had this problem... ?
I had a project that was working fine, but now I cannot watch a video preview by pressing enter or space. The timeline renders the preview then does nothing, just sits there. The play button in the program monitor changes to the stop symbol, just like it does when the video preview plays normally, but no video or audio is playing...
Please help!
TR

Captured PAL HDV footage (1080i50)
Premiere Pro v3.0
Mac Pro Quad Core 3gb memory
Mac OS X 10.4.11
What else do you need to know?

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