My 27" iMac displays vertical green lines when turned on and then will not boot up

Can anyone tell me why my 27" iMac displays vertical green lines when it is turned on and then will not boot up?

Welcome to Apple Support Communities
The display or graphic card are damaged. The only thing you can do is to take your computer to an Apple Store or reseller to get your computer repaired.
If you use an external display with your Mac, connect it to your computer and see if these lines appear on the external display. If so, it's a graphic card problem

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    I'm having a big problem with my iMac 24" when I'm using Aperture or iTunes music videos in full screen mode.
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    •Installed Aperture, the problem started showing itself sporadically
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    Here are the full OS X Mavericks: System Requirements
    Learn about the system requirements for OS X Mavericks.
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    MacBook Pro (13-inch, Mid-2009 or later),
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    MacBook Air (Late 2008 or later)
    Mac mini (Early 2009 or later)
    Mac Pro (Early 2008 or later)
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