Lost video and sound

Was happily making a movie. I reviewed it and got a screen which was all pixelated. Made the mistake of saving at that point. Now, although my movie looks fine in the time line, when reviewing my movie, I get sound at the start, but no video. Sometimes I get no sound as well.
What happened? It looks ok in the time line, but even when I select a clip, I get to video in the video window.
Help!

OK, here's some more info on my iMovie dilemma.
When I preview my movie, I see no video, and only some of the sound clips/music work. I cannot trace it to a single sound track, however.
I tried to send the movie to my camera, and it worked perfectly (video and sound in the camera and video on the computer), until it reached a certain clip (actually a photo with the KB effect).
When I dig up the media file for that clip, it plays perfectly in QT. in iMovie, however, (during the camera export) all I get are pixels and basically the movie quits there. Although it moves across the timeline, nothing shows in the viewer and I get a blue screen on my camera.
After that, when I previewed the movie, I got nothing; just a bar moving across the timeline. Restart iMovie, and I get the same result I started this post with.
When I began the import to the camera, I got a notice about some clips needing to be rendered. Out of fear of messing things up more, I chose proceed only, vs render and proceed. Would choosing render and proceed fix it, I wonder . . .

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I know this seems like a very long process, but it actually doesn't take too long (at least with music videos), and it's well worth having the audio and video ligned up properly. So hope it works for you all, let me know how it goes :)
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EDIT: oh yeah, and after you have your converted file using Xillisoft or Videora, you can delete the AVI file and keep the original if you want.

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Video and sound

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willis45 wrote:
My laptop starts to freeze and sound is distorted some minutes after I start playing I Games and videos .It started a day after there was unstable electricity were I live.
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I am a Volunteer to help others on here-not a HP employee.
Replies aren't online 24/7 because of Time Zone differences.
Remember in this Day and Age of Computing the Internet is Knowledge at your fingertips if you choose understand it. -2015-

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