HD not booting. Circle with a cross through it

Hi Everyone.
I was getting an issue with system prefs and opted to restart my MBP.
After the start up sound, for a split second it showed the Apple logo followed by a circle with a cross through it.
Then it proceeded to boot up on my BootCamp windows partition. So I know the HD is working.
So, I started up the MBP with an external firewire drive that had an older complete copy of my drive from my OEM 500GB HD before my upgrade to a new 1TB drive. Then I ran Disk Utilities, verified that the Drive was OK, ran repair disk permissions and then did a Directory reconstruction with DiskWarrior. I hoped that all of the above would fix the problem. Alas, it is still not booting up from the 1TB drive.
With the external boot, I can see everything on the internal drive ok. I thought it may have been a resource fork, but I don't know now.
Anyone have any suggestions of what else I should look for?
My last resort will be to wipe the drive and rebuild from Time Machine, but a month has passed since my last back up ( so some stuff may be missed out).

If you want to see if you can recover data, see my FAQ*:
http://www.macmaps.com/backup.html#RECOVER
The fact that Disk Warrior can't fix the system folder, means there is serious file corruption, which may be as a result of all the issues with your System Preferences.
If you were using any other system optimization software, any that clean system caches should be avoided. They can make System Preferences and the rest of the system misbehave because corrupted system cache files can make applications have a hard time starting up.

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HD not booting. Circle with a cross through it

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