My video isn't displaying

Okay, I am a total newbie to video editing. I was able to make a video and add audio, but now when I try to play it to view it, it plays but the preview screen is totally blank. I get no sound or video. I also can’t seem to export it into a whole video format. I tried to search the forum for help, but the topics all use terms that are way above my knowledge base and I am not sure where my help might be. Any suggestions would be greatly appreciated.

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