Model A1419 / Late 2012 / 2.9 & 3.2 GHz Core i5 or 3.4 GHz Core i7 Processor

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iMac shut down after plug-in faulty USB hdd, won't turn on after

Imac 27 late 2012

Hi Guys, I have iMac 27 late 2012 and it won't turn on after I plug in fully USB HDD. iMac was power on and I plug in the fault HDD and it shut down iMac right away. I unplug the fail HDD and try to reboot the iMac but nothing happen. I open the screen and check if any failed... when plug in only 1st light on... and nothing happen when I press power button. Please help me if any thing can rescue my iMac. Thanks

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Here's how to replace your failed power supply: iMac Intel 27" EMC 2546 Power Supply Replacement

You'll need the replacement adhesive strips: iMac Intel 27" (EMC 2546, 2639, 2806) Adhesive Strips

This power supply is comparable but out of stock: http://www.powerbookmedic.com/iMac-27-Po...

Apple Part #:

661-7170

Manufacturer Part #:

ADP-300AF T

UPDATE 7/5/16

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.

iMac Intel 27" (EMC 2546, 2639, 2806) Adhesive Strips Image

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so you thinks it was power supply... as i said, when power cable plugin LED1 is on and nothing happen when power button press. thanks

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see my update to answer

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Thanks Mayer, I will buy new power supply and test... Will update when it have the part.

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Please examine your logic board for burns,especially around the leads into your USB port before spending any money. If you have burned it out (and it could be just that one port), if a logic board replacement is involved the cost of repair may be higher than what the machine is worth. Normally the logic board is not involved in a power supply failure but yours may have been.

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