Persistent problems with Lion boot

Hi all.

I have buyed and installed Lion from Snow Leopard on a 1 year old MacBook Pro 15".

Now I can boot correctly 1 time, and when I power off or restart the PC it hangs on the Apple logo with the loading simbol.

If i boot verbose, it locks here:

If i boot in single user and i do a fsck and reboot it start, but it say me that it delete some orphaned files or directory.

I have also reinstalled Lion with the CMD+R console reinitializing the partition, but after a reboot the problem is the same.

The HDD is a WD Caviar Black 750 Gb, and it hasn't problems.

Booting with windows 7 there isn't problems...

Some ideas?

Thank you!