Model A1312 / Mid 2011 / 2.7 & 3.1 GHz Core i5 or 3.4 GHz Core i7 Processor

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Screen stays black on startup

I have read lot's of threads on this site about this problem. I didn't find the solution to my specific situation.

At first this problem was random. Now it's consistent so I can't boot up. At first I thought that this was a software issue so I did a clean install of Sierra.

Problem:

  • Chime sounds on startup
  • Screen stays black

I have tried resetting the PRAM. This seemed to help a few times.

Diagnostic leds 1, 2 and 3 (left-to-right) light up on boot. Number 4 doesn't light up.

Answered! View the answer I have this problem too

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Chosen Solution

Apple may still be covering it:

iMac (27-inch): AMD Radeon 6970M Video Card Replacement Program

https://support.apple.com/en-us/HT203787

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Sampsa Kuronen will be eternally grateful.
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