Hi guys, I started up my 24" iMac today and it just got stuck on the grey screen before the apple logo appears. I reset the PRAM and I tried using the OSX disc and holding down C. I got to the disk utility and it freezes. I've tried searching around but I can't find much to help me. Any help would be great because im stuck using my bottom of the line laptop untill I can work around this. Thanks.