I start my I mac 21.5 inch led 16:9 widescreen computer but the screen is black, I hear it starting but the screen still black. and the screen is black, I hear it running but till the screen black

I start my I mac 21.5 inch led 16:9 widescreen computer but the screen is black, I hear it starting but the screen still black. and the screen is black, I hear it running but till the screen black

Try a safe boot.
     Shutdown your machine.  Hold down the shift key.  Poweron.  Wait awhile; wait awhile while you harddrive
     is being checked.
     http://support.apple.com/kb/ht1455
Report back results.

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