Model A1312 / Mid 2010 / 3.2 GHz Core i3 or 2.8 & 3.6 GHz Core i5 or 2.93 GHz Core i7, ID iMac11,3

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iMac 27" 2010 Chime loop and black screen issue

After system update (High Sierra) I get a black screen and the start up chime continuously loops. Keyboard commands do not work neither does putting in an OS X disk as the disk drive.

I also tried to plug in an external display (MacBook) using a Mini Display Port to Thunderbolt cable and I've got no signal.

Removed all RAM (4x2GB) got error beeps, put 2 back on and got the chime loop with the black screen.

Diagnostics LEDs: #1 is always on, #2 and #3 are on when the iMac is started, #4 is off.

What could be the cause of this issue? The computer has been working perfectly until now.

Answer this question I have this problem too

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Your MacBook won't work as an external display. You can hook it up via the Fireport and try to access the iMac's hard drive using Target mode. But my bet would be on a failed GPU. It will probably need to be replaced. I have also had about a 70% success rate with doing a hot air workstation reflow.

iMac Intel 27" (Late 2009 or Mid 2010) Graphics Card Replacement

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niko will be eternally grateful.
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