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Model A1418 / Late 2013 / 2.7 & 2.9 GHz Core i5 or 3.1 GHz Core i7 Processor

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Only led 1 turns on, hdd does begin blowing

I was working on my iMac and all of a sudden the screen goes black and it never has powered on from then, I opened it up and had a look at the diagnostic LED’s and only led1 turns on when connected to power. When I press the power button I can hear the hdd blowing, while no other led it being lit up. If I hold the power button the hdd beeps very silent and stopt blowing. Can anyone help me? Could it be the power supply?

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Most likely from your description.

iMac Intel 21.5" EMC 2638 Power Supply Replacement

Update (03/07/2021)

Basically you have the onboard diagnostic LED’s

Block Image

Here's a breakdown on what they mean

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.

Then you have measuring the voltages if you have the DVM and know where to measure. For most the LED’s are enough.


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Is there any way I can check to make sure the power supply is broken?

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