I can't start my imac tried everything in the manual please help

imac won't start tried everything in the manual could it be my power cord?

Hi i've had a similar problem with my iMac.
I bought it from the apple store yesterday so im guessing its the new 2011 model and it was the one retailed at £999.
I used the apple software update and it downloaded a mac update in which required a reboot. It begun to reboot and it played the boot up noise but the screen didnt turn on and it has been like it for well over an hour now and I don't really know what to do.
I tried a few things on the support forum such as to try and boot from the disc but nothing seems to work.

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