Blank screen and non responsive 21.5 imac

updated live8 + cubebase5. ok. 5mins later computer is dead but i still hear some sort of life inside.
like it is asleep. tried restart with alt/command/p/r held down nogood. tried restart with system disk, held c nogood. could not start in safemode. all cables unpluged.......
what has happened ?????? ANYONE?????

If you're running OS X 10.8.5 or earlier, then from the menu bar, select
 ▹ System Preferences... ▹ Accessibility
If the checkbox at the bottom marked
Enable access for assistive devices
is checked, uncheck it and test.
If you're running OS X 10.9 or later, select
 ▹ System Preferences... ▹ Security & Privacy ▹ Privacy ▹ Accessibility
If any applications are listed on the right and have a checked box next to them, uncheck all the boxes and test. You may first have to click the padlock icon in the lower left corner of the window and authenticate as an administrator to unlock the settings.

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If you're running OS X 10.8.5 or earlier, then from the menu bar, select
 ▹ System Preferences... ▹ Accessibility
If the checkbox at the bottom marked
Enable access for assistive devices
is checked, uncheck it and test.
If you're running OS X 10.9 or later, select
 ▹ System Preferences... ▹ Security & Privacy ▹ Privacy ▹ Accessibility
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Hi, beth.lau.gr.
Thank you for visiting Apple Support Communities.
I understand you have been experiencing issues with your iPhone restarting and showing you a blue screen. I wont be able to give you an exact answer as to why this is happening. However, this is the most relevant troubleshooting article for this issue. This article also provides options to reach out to us via phone for additional assistance.
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http://support.apple.com/en-us/HT203899
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Hi Darr4425,
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Follow us on Twitter @VZWSupport
If my response answered your question please click the "Correct Answer" button under my response. This ensures others can benefit from our conversation. Thanks in advance for your help with this!!

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thanks and regards
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Wanlucg wrote:
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iTunes free download from www.itunes.com/download
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The search box on top-right of this page is your true friend, and the public Knowledge Base too:

Blank screen and non responsive 21.5 imac

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