How can i fix black screen imac27?

hello
please help me,
my imac 27 display is dark after start up, i can hear sounds but dark display..
this happend after shipping it.
computer from america,and now i try to use it in europe..

Hey there arpadm,
It sounds like your screen is black, but you can otherwise tell the computer is on. I recommend these steps from the following article named:
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/ht1573
Reset the system
You can reset the Mac's parameter RAM and SMC.
Reset the resolution
Start by resetting the Mac's parameter RAM. If the display does not come up, was previously set to an unsupported resolution, and still results in no video:
Start up in Safe Mode.
From the Apple () menu, choose System Preferences.
Choose Displays from the View menu to open the preferences pane.
Select any resolution and refresh rate that your display supports.
Restart your computer.
Thank you for using Apple Support Communities.
Cheers,
Sterling

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