Booting the compute: It wants to start then the screen get a big red stop sign and will not finish booting

I turn on the computere.  It starts to boot I get the apple logo in the center of the screen.  Then I get a red stop sign in the middle of the screen.  The small wheel is still turing but the computer will not start. 

Start your iMac with the original DVD that came with the computer then run disk utility on the hard drive to repair it, also repair your permissions. 

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