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Model A1419 / EMC 2806 / Late 2014 or Mid 2015. 3.3 or 3.5 GHz Core i5 or 4.0 GHz Core i7 (ID iMac15,1); EMC 2834 late 2015 / 3.3 or 3.5 GHz Core i5 or 4.0 GHz Core i7 (iMac17,1) All with Retina 5K displays

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iMac not powering up

I have an external portable Freecom self powered USB drive which did not mount on my older MBP. It just clicked continuasly, its utility password partion would mount momenteraly and then turned its blue light off. The mounting problem is the least of today's disasters…

So I powered up my imac and connected the external drive to it to see if it mounts on the imac.

Once the freecom was connected , the imac turned off immediately and it would not turn on again.

Checked power, disconnected power cable, waited, tried again, tried SMC. No change. The iMac will not power up

Would could it be and how can I identify what is wrong?

How can a drive with mounting issue cause the iMac to die?

Thank you

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Ouch! The drive may have a short across the power and data lines.

Let’s see if we can get your iMac working. Disconnect everything from it as well as the AC cord. Now press and hold the power button a good 30 secs. Now plug the AC cord back in and now press the power button again did you get any response from your system? Fan noise?

Update (02/20/2020)

Here’s the location of the diagnostic LED’s

Block Image

Here's a breakdown of the onboard diagnostic LED's:

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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Thank! I tried disconnecting power cable both ends, reconnecting, holding power button for different durations, 30 sec included, no reaction whatsoever unfortunately. no sound, no lights. I know the power is getting to the mac socket because I checked the line with a voltmeter and it receives voltage

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if the extrnal drive has a short it would probably have the same effect on the MBP as it did on the imac, however the MBP did not die because of the external drive, it just did not mount. everything was working ok just 24 hours earlier althought the drive sometimes took a longer while to mount or needed to be reconnected after not mounting initially.

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At this point you'll need to check the onboard diagnostic LED's to see what they tell you. Follow this guide iMac 英特尔 27 英寸 Retina 5K 显示屏更换 but for you do make sure you have the special adhesive cutter with is part of the [关联产品丢失或禁用： IF174-005] kit.

The logic within your MacBook is different from the iMac so you can't depend on that to discount the fact your iMac system is dead and the only thing you moved was a questionable HDD.

由完成的

the screen removal procedure seems very risky. if indeed the external USB drive is shorting, what is likely damaged in the iMac as a result?

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Hard to tell without seeing what the diagnostics tells you. I'm guessing the power supply is the most likely, then the logic board.

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