Green screen keying not working?

Hey I am messing around with green screening and on my computer at home it was working fine.
Now (with the same footage) at my school campus. When I apply keying and select a color... nothing happens.
I tried moving every slider in the inspector and some things changed (brightness/color) but the "green" never went away.
Anyone know why this may be?

I just tried it again on different footage that was working last week here on my school computer and nothing.
I am running my project off of a usb 3 flash drive if that helps on final cut 10.0.9

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Green Screen Video not working audio working

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Have you turned on Advanced Tools in iMovie Preferences?
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Has anyone actually got the Green Screen feature to work?

Has anyone actually got the Green Screen feature to work? I've been trying for about 8 hours, absolutely no success. I have followed the iMovie Help instructions and the examples on the internet, over and over again. I've tried every imaginable variation on the instructions. Nothing from my green movie shows up. The green in my video is pure green - 100% green, 0% red and 0% blue. Yet the non-green images in the video aren't getting displayed at all. Several other people have mentioned a similar problem on these forums and they are all "unanswered". Is that because this is an unsolvable problem? Is it an iMovie bug? Sigh. I'm a big fan of Apple but stuff like this gives them a bad name.

After several more hours of diagnosis I have identified some conditions which can make Green Screen slightly work (but not much). The condition is as follows. The green screen clip must be carefully dropped at the beginning of a video clip, such that at least the first two seconds of the green screen clip (no less, but no more or the clip will become attached to the previous clip and then it's broken again) are displayed over the PREVIOUS video clip. But the green screen will not work on the previous clip, only on the second clip. So you will always lose the first two seconds of the green screen video. It took me a lot of experimenting to discover this anomaly.
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Thanks Xardas,
I have essentially done both - tried Toshiba OEM status found on a small partition of the toshi hard drive - no good - then did a fresh install of Windows 7 - still no good
You know - as cunning as it sounds - i cannot reload the default settings in BIOS as it requires the END key to work so i can Save & Exit - all i can do is Exit Without Save - i sort of feel snookered at the moment.
Toshiba got back to me today and said that i have tried everything they would have (yeah for sure) and to take my machine into a service centre for a hardware check - yeah right on boys!
Check out this guys post below found on Kioskea.net - getting close to a year ago...
ms ml - Nov 10, 2009 12:52am GMT
Hi there, I was hoping that you might be able to help me with the problem that I seem to be having with my Toshiba Satellite Laptop Keyboard too. For a few days now I havent been able to use a few of the keys on my keyboard, including (1) delete (the backspace key is still working though), (2) colon/semicolon, (3) apostrophe/quotation marks and (4) end (the home and PgUp and PgDn keys are still working though). Any suggestions?
Identical to my problem....obviously this guy had the same problem as well...see below - same thread.
yab - Feb 9, 2010 4:47am GMT
hi did you ever figure this out? i have the same exact problem...
However, i was not able to solve my problem the way this guy did - my scroll lock is not activated - it seems to work ok (on and off) i tested it using Excel to move around the cells.
yab ms ml - Feb 9, 2010 7:57am GMT
Nevermind. For me it was scroll lock. My apostrophe, semicolon, and delete keys are alive and working again. I hope you have the same easy fix.
Incidently - never hear from the first guy again - probably ended up being his scroll lock.
all sugestions welcome - sorry my smily face has no eyes -) guess why!

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KeyRelease event, serial 40, synthetic NO, window 0x1800001,
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