Macbook Air keeps loading
I was making a video in iMovie, but then suddenly, I couldn't add any more clips - my disk was full. So I tried to save it, but after few seconds it said the same again.
I know that I should have reacted properly before, when the "disk is almost full" sign came up, but I thought I should be able to finish that project at least. When that sign came up, I just restarted the macbook and everything was fine again, so I tried to restart it. What happened was that when iMovie popped up it started loading and it wouldn't stop. I tried force quitting, but only finder came up. Relaunching it didn't do anything. I also tried to switch user, but that one started loading, too.
I don't know what else to do. Please help!
MacBook Air