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iMac 27 " A1312/MC813 Why is my screen stay black after I power on?

When I power-up my screen goes from gray to black. It stays that way, but I can hear that it is running in the background. How do I fix this?

iMac, 27" Core i5 (mid 2011) A1312/MC813

Posted on May 5, 2015 1:54 PM

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iMac 27 " A1312/MC813 Why is my screen stay black after I power on?

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