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Modelo A1312 / Mediados de 2011 / Procesador Core i5 de 2.7 & 3.1 GHz o Core i7 de 3.4 GHz

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Why does my iMac shutdown halfway through startup?

I have a old IMAC that halfway through booting I have read it maybe do to thermal issue but am looking for instructions on diagnosing it.

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What do the diagnostic LEDs indicate? Boot up your iMac and observe what the diagnostic LEDs do. Yes, it’s safe to start up your iMac without the screen on. Just don’t touch any of the components or parts inside the iMac. The location of the diagnostic LEDs are circled below


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LED 1 - Indicates that the trickle voltage from the power supply is detected by the main logic board. This LED will remain ON while the iMac is connected to the AC power. The LED will remain on even when the computer has been shut down or put to sleep. The LED will turn off only if the AC power is disconnected or the power supply is faulty.

LED 2 - Indicates that the main logic board has detected proper power from the power supply when the computer is turned on. This LED will be ON when the computer is turned on and the power supply is working correctly.

LED 3 - Indicates that the computer and the video card are communicating. This LED will be ON when the computer is communicating properly with the video card. If LEDs 1 and 2 are ON and you heard the startup sound, but LED 3 is OFF, then the video card might be installed incorrectly or need replacement.

LED 4 - Indicates that the computer and the LCD display panel are communicating. This LED will be ON when the computer is turned on and video signal is being generated. If the LED is ON and there is no image on the LCD display panel, the LCD display panel or inverter might be installed incorrectly or need replacement.

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Please let us know your exact machine as there are known issues with the 2011. The information is on the bottom of your stand.

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I have the same problem, shutting down halfway through start up, on a mid 2011 model imac 27 inch, EMC 2429

No hardware issues according to Diagnosis and new hard drive with fan sensor fitted. Have used internet recovery but no progress. Cannot access disk utility.

Grateful for any suggestions.

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Brian Stewart estará eternamente agradecido.
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