Hi there, So... Here is the thing, I have a MacBook pro of 15" with a i7. Today, I decided to clean up the system. Opened cleanmymac app, done everything and booted. It took a while and then the blue screen, changes from one tone to another with a little "loading" graphic on the bottom. Since this already happenned to me before on my older MacBook pro, got the lion DVD inside the drive and used the "c" to boot from the cd. The grey screen came, then logo, everything normal but t was taking too much time to boot the cd, 10min passed and ... Nothing. Searched a bit on this, reset on pram and nvram same, booted with the "n" same. Tried to boot in safe mode, doesn't work. Fsck, first it says it was modified, done once again and hard drive ok so... Try to boot once again and blue screen, got under fsck once again and says it was modified, fsck once again and drive ok, tried to boot cd, stuck on logo... I also tried something I found on Internet to do with some preferences files but... Same old same So... How can I fix this? Any idea?