I have a 2010 MacBook Pro, version 10.6.4 Mac OS X. I need to update my so I clicked "software update" and finished updating everything fine. When I had to restart, it tries to restart but I am left on a screen which is the purple aurora borealis (the standard mac background. first image if you google "mac background"). My mouse is also visible on screen and I can move it around. I have waited and nothing happens.