I'm trying to help a friend fix their MacBook, and I've run out of ideas. I've gone through every resource I can find, so hopefully someone has some insight into this problem.
When the machine starts up, it gets to the gray screen with the apple logo and spinning wheel, and goes no further. Safe boot is not possible; it stops at the same gray screen, but will automatically restart if left alone for a few minutes.
I've tried running Disk Utility, but it said the disk was fine. I've also tried an Archive & Install, but it had no effect on the problem.
Is there anything else I can do to diagnose the problem, or are there any common problems with similar symptoms?