Rush video appearing as Black

I recently took some time to edit a video. Then I exported it, and attempted to upload it for youtube. It wouldn't upload because of processing, which is its own problem that I am trying to fix. But when I open the file for the video, it showed as black. I closed it and opened it again. Still black. I thought it was my computer, so i checked other videos to see if it was my computer's fault. They were fine. I can't re-export it because my first three exports expired. Anyone know what to do?