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対象のモデルはA1419 / EMC 2806 / Late 2014 または Mid 2015。 3.3 または 3.5GHz Core i5 または 4.0GHz Core i7 (機種ID iMac15,1)、EMC 2834 late 2015 / 3.3 または 3.5 GHz Core i5 または 4.0 GHz Core i7 (機種ID iMac17,1)のRetina 5Kディスプレイを搭載したすべて。

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Late 2014 iMac 27inch retina. Switching one when mains power applied.

Hello all,

I have had my iMac, from new, since early 2015 and have never had this problem until recently.

The problem is as follows:

I have always shut my iMac down completely then switched off the mains supply to the computer, this has never been an issue.

However, of late when I come to switch the iMac on by first switching on the mains power, the imac will switch itself on without the power button being pushed.

Also, If, on occasion it does not switch it's self on (about 1 in 10 times) the start up tone does not sound until 20 -30 seconds after the power button is pushed. Then it will start the boot up process.

As I say I have had no issues at all with this computer until the last 2 - 3 weeks.

I have done all the resets recommend and completely clean install of the latest version of Big Sur, None of this as made any difference.

The Mac spec is:

iMac (Retina 5K, 27-inch, Late 2014)

4 GHz Quad-Core Intel Core i7

32 GB 1600 MHz DDR3

AMD Radeon R9 M295X 4 GB

Thanks in advance for any advice offered.

Regards

David

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Ah! You've run down the NVRAM battery! The iMac requires a vampire trickle from the power line otherwise its strictly the coin battery and as the settings are getting lost now the system will react this way. Apple of course placed the battery in the hardest place to get to the backside of the logic board so you need to fully remove it to get to it! (bad design choice)

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So this is a big job needlessly! If you've never opened an iMac I would let a good mac repair person or Apple deal with it.

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Hello Dan,

Thank you for the quick response and answer.

This seems like the problem, I was probably hoping there was some other easier fix, however, all the forums are pointing me in this direction.

I've recently been considering upgrading the ssd in this iMac so now might be the time to carry that upgrade.

I am confident to give this a go myself, I'll purchase the correct tools etc and research the fix.

Is there any other hardware you would recommend upgrading while I have the iMac open?

Thanks again for the advice.

David

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@David Wilson - I would stick with either an Apple OEM SSD or go with OWC. Make sure you are running Mojave or higher before you upgrade. You might want to get the OWC ENVOY PRO 1A case to hold your old SSD.

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Thanks again Dan, apologies for the late response.

David

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@David Wilson - All good! So between the battery and replacing the SSD you've got your system running?

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David Wilson さん、ありがとうございました！
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