My iMac Display doesn't work!

I hear the sound when he starts but the display stays dark! why?
Please Help me!!!

First, detach any peripheral devices except keyboard/mouse. Then reset the SMC:
Shut down the computer.
Unplug the computer's power cord.
Wait fifteen seconds.
Attach the computer's power cord.
Wait five seconds, then press the power button to turn on the computer.
If that doesn't change anything, follow the steps in this Apple note: http://support.apple.com/kb/TS2570 . When you get to the section on using Disk Utility to repair the disk, use Lion recovery mode by booting with command and R held down. Assuming of course by then you can view something on the screen. If the screen still doesn't work, take it in for service.

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