When I Add green screen, it doesn't even appear

I have enabled advanced oiptions, I have a downloaded green screen of a helicopter flying, I have video footage of myself in my study. I put the video of me in the timeline, then drag the green screen movie on top, chose green screen. Nothing happens. I get the audio from the green screen movie but no picture on top of the original movie!!!! Please help me. Important for a school project! Thanks!
sogftware: iMac ver. 10.6.8
                iMovie '09
All the software is fully updated. I've also tried cropping the green screen and it still doesnt work???

Woo Hoo...
I've found a work-around that will solve the problem you are having.
The issue:
The iMove software asumes that you are using a homemade green screen background ie: badly lit with movement and uneven green (or blue) colour. When you use a pre-made green screen backgound like the one of the helicopter (me and) you downloaded the sofware cant detect it because it is too good!
The solution:
1) Import the clip into iMovie, then go to the video inspector, then to the clip tab,
2) Select  Video Effect, then select the "Vignette" option (it should leave a fuzzy black border around your clip).
3) Export the adjusted clip (choose the quailty you need).
4) Import the "new" clip then apply it as a green screen to your background footage.
5) You may need to tweek the colour in the video inspector for best results.
I hope this helps
Andrew

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