Original Files Are Missing in Final Cut Pro X

I was importing a video file off my iPhone via USB into Final Cut Pro X and then it crashed... When it reopened, all my media files were missing; pictures, media clips, audio, etc, gone.

Naturally I researched it and found tutorials and read forums but the tips didn't help. All I could find was "relinking' the files and clicking on the 'backup' projects... but that didn't work either. I'm sure I'm a few clicks away from a solution. Can you help me repopulate my media files.

I'm working on a MacBook and all the files should be on this laptop.

Thank you.