Start up screen PROBLEM!!

The start up screen bings and then apple logo with circle loader - thats it!! why wont it start up?

same happens to me. Using "Command-S" to boot in single user mode then, "applejack" option3 clear chache or "mount -o rw /" state:
jnl: disk0s2: journal_open: Error replaying the journal!
hfs_mount: journal_open == NULL; couldn't be opened on Macintosh HD
mount_hfs: Invalid argument
so the remount into R/W fails.
fsck -f(y) are ok without errors
"repair permissions" in applejack is ok too...
Any hints?
(LION, 10.7.4, MBP)

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