So yesterday I updated a bunch of programs on my macbook via the autoupdate function. Some of the programs I updated required a restart...which I performed when it prompted me to. Now my macbook won't restart all the way. It turns on and gives the chime then goes to a gray screen with an apple on it. After about a minute a spiral loading image appears underneath the apple and about a minute after that the computer shuts off and immediately restarts again only to do the same thing (its stuck in some sort of cycle). If anybody knows what this problem is please let me know what I can do to fix it. I've tried resetting the PRAM and a few other things but nothing seems to work. Thanks in advance for your help!