Help with a disappearing video sequence on Final Cut

I was working on my video and suddenly, the video sequence disappeared. The audio tracks are still there and the video tracks are still on my timeline but nothing appears in the canvas when I try to watch my video. I checked every one of my projects and it's the same for all of them. I also can't start any new projects - the visual parts just don't show up when I'm trying to edit though they do when I export the video.

Also I'm not sure whether this has to do with it but when I restarted my computer, my desktop when to default then went completely black then back to default. It also, at first, only gave me question marks in place of pictures though that's gone away now.

My project above just shows what it look like right now. Clips show up in the viewer but not the canvas.

I have 17 projects that are completely lost at the moment so I would love some help if you know how to fix it!