iMac don't start...second LED lights up intermittently every 3 seconds

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iMac Intel 27" Retina 5K Display (Late 2014 & 2015)

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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JOAQUIM LOPES RAMALHOSA @boxerboss

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发帖于: 2024年4月18日

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iMac don't start...second LED lights up intermittently every 3 seconds

Hello

iMac don't start...second LED lights up intermittently every 3 seconds

Already replaced power supply with the power supply of my other 2012 iMac 27"...and do the same...

Any help to find what is the fault?

Best regards

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Dan @danj 声誉积分: 479.7千 Self employed contract worker 35 329 971 · Answer 1 · 2024-04-18T12:08:37-07:00

Dan @danj

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发帖于: 2024年4月18日

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What transpired before you replaced the power supply? Did you alter anything like add memory, replace the CPU…

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Hello

One year ago (more or less), when reassembly CPU on socket (after replace Thermal Past/Thermal Pads), bent 2 pins on socket (but correct this issue), also "split" Fusion Drive (replaced the Apple "Blade" with a OWC 480Gb and SSD SATA Crucial MX500 2TB), upgraded RAM from 8 GB to 32 GB, replaced PRAM battery(BR2032)... and works great for a year...

Some days ago iMac won't start...I changed the power supply because it didn't start...but don't solved the issue...

Could this be related to the issue of socket bent pins ? (a year ago)

由 JOAQUIM LOPES RAMALHOSA 完成的 2024年4月18日

@boxerboss - Sadly yes 😡 the bent pins are weaker and over time fail. You could try reseating the SO-DIMMs. Do you have an external bootable drive to double check if the current boot drive is messed up. But I’m leaning the socket is the issue.

由 Dan 完成的 2024年4月18日

Hello

I already removed RAM and put it back in...issue persists

Do you mean to try with a USB bootable Big Sur?(the macOs installed)...and try to start in Recovery Mode?...or Safe Mode ?

由 JOAQUIM LOPES RAMALHOSA 完成的 2024年4月19日

@boxerboss - I just find having a bootable external drive is quicker to just boot up from. You can also try booting up under anyone of the Startup options, do any respond?

由 Dan 完成的 2024年4月19日

Can I create a "bootable external drive" for my iMac in other Mac?

由 JOAQUIM LOPES RAMALHOSA 完成的 2024年4月19日

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iMac Intel 27" Retina 5K Display (Late 2014 & 2015)

iMac don't start...second LED lights up intermittently every 3 seconds

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