I think my toddler son may have gotten to the computer and put the HD in the trash. I was doing my usual computer business when I noticed that I couldn't open up folders to see their content. I then noticed that the hd icon wasn't on the desktop! I assumed it was in the trash, but when I doubleclicked, it wouldn't open either! I figured that by restarting, maybe the hd icon would return. It did not. My computer starts up, shows me the mac icon, then shows a completely black screen with this terminal looking prompt: Someone please help.