Mac Pro during start up, chimes, apple logo then shuts down.  Just began

My Mac Pro (with Cinema Display) during start up, chimes, fan, apple logo then shuts down.  Just began. Will not complete the boot 

The chime is generated in software when your Mac passes the Power-On Self Test. If a suitable source of software can be found, booting is likely.
The dark gray Apple is not resident in any ROM. It can appear only after it is loaded from a boot device.
Your Mac will shut down during boot-up if the Boot Drive is so damaged that it cannot be mounted.
So focus your energy on repairing your Boot Drive using Recovery_HD or the 10.6 DVD, as appropriate.

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