Grey Screen! - can't get past it!

Sorry I'm a newbie and muy lovely Mac pro is DEAD! - I just get the grey screen and wheel.
I've tried to Safe boot
Tried to re-install but it just won't come off grey screen.......any ideas????

Next time this happens, try repairing the file system by booting into the MacOS X installer on the DVD and then launching Disk Utility. A Genius did this on my MacBook Air recently after it refused to start up with the same symptoms (grey screen, wheel spinning forever) and this brought it back to life.

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