When I closed (put to sleep) my macbook earlier today it made the same sound which it makes when you open it from shut down or if you restart it even if I just closed it. When I got back home the background was blue and now I can't open any of the files/documents or folders on my desktop. Also I can't seem to change the background picture and when I tried moving files from the trash to the desktop they wouldn't move. Everything else seems to be fine. Safari, iTunes, email, they all work without a problem it's just the desktop which seems "locked" or something. Can someone help???