Sony Vegas won't render MOV files?

I have taken about 7 videos on my iPhone 5S that I need to make into a project on Sony Vegas. I have put all the videos together, with a lot of trouble because the preview is so laggy and I have tried everything to fix it but nothing seems to work - when making videos the preview is never usually this laggy. I tried to render the project, but all that renders is the sound and a blank screen. I've tried all different settings for it to work, I've googled for a solution but I can't find anything. Could someone possibly help? It's really important!

Added (1). I forgot to mention that this is Sony Vegas Pro 12.0

It does, you should know how to make it, you can take youtube lessons for that

As I know, MOV video is not compatible with Sony vegas. You may convert your MOV video to AVI video for a try, it should work. If you don't know how to convert video, I think this step by step direction would help you a lot.

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