A couple of days ago I was on my macbook and the mouse began to move on its own. I fought to turn off my Wi-Fi and that did not solve the problem. So I turned off all of the screen sharing, extra and still no solution. So I changed my password and installed avast. It did not find anything. Today I turned on the MacBook and it won't go past the grey apple loading screen. I put in the disk and ran disk repair. It didn't find anything. I don't know what to do! Please help 
