IMac is starting up but screen is blank/dead? Help!

Hi.
Our iMac is starting up.....I can hear it loading. However the monitor screen is completely blank/dead with no backlight.
This has just happened. I have switched it off and unplugged from the mains before trying again but no luck!
Could anyone advise?
Thanks

Contact Apple or your local Authorized Apple Service Provider and make arrangements to have it checked out. Apple - Support - iMac - Service FAQ

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IMac is starting up but screen is blank/dead? Help!

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