My video is suddenly really slow before flashing a bright green screen.

I started editing on my Macbook Pro with my FCPX free trial, then went back to edit the same project on a school computer. I've done this countless times before with no issue, but the program is suddenly running really slowly. If I try to play, the footage will start fine, but after 2 or 3 seconds it will start lagging until the video goes away entirely and is replaced by a bright green screen. Moving clips around also causes the turning wheel to appear for at least 20 seconds before I can finally continue editing, but even then I can only do that one move before the turning wheel comes back.The footage is only 3.5 minutes long, and I'm not trying to do anything I haven't done before.
What could be causing these issues, and how do I fix them?

Tony,
The video is from the same camera as all of my other projects (JVC 100), but since it is a partner project, another girl filmed it (she has had no issues). My hard drive crashed on the 6th, and prior to that FCPX would not open while it was connected, but had no problem opening without the drive. I think it's safe to assume that it was my hard drive causing all of the problems, but I'm going to go in and ask an Apple employee if there is anything else that I can do to prevent this from happening in the future.
Thanks for all of your help.

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**Click the KUDOS thumb up on the left to say 'Thanks'**
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