My friend has a 2011 13" MacBook Pro running Mt Lion. Yesterday he noticed on his dock three items wouldn't load their logos until he clicked on them. Today when he tried starting his MacBook it went to the Grey Apple logo screen, below the Apple it showed a pinwheel spinning (white in color) and a loading bar underneath that. The bar will load all the way, disappear and then the MacBook shuts off. I haven't had the chance to run it in safe mode yet and run the disk utility (if I can even get it to that point). Any ideas as to what could be wrong, or has anyone had this problem before? Any help will be greatly appreciated. Thank you.