Black screen during boot

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iMac Intel 21.5" Retina 4K Display (2017)

A1418/EMC3069/2017/3.0GHz四核心Intel Core i5、3.4GHz四核心Intel Core i5或3.6GHz四核心Intel Core i7处理器。于2017年6月8日发布。

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Dmak @dmak13718

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发帖于: 2023年7月7日

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Black screen during boot

Hello all, I have an iMac that, under normal conditions doesn't fully boot, pressing the power button I get the chime with the Apple logo, a progress bar starts but before I get to the login screen the display goes black. The only way to get it back is to unplug the iMac and plug it back in, but in the end the exact same thing happens.

The big catch here is that it boots and seems to work perfectly fine in Safe mode.

This is fresh install of macOS, so my question, would anyone know if a bad or failing hard drive would cause this sort of issue??

TYIA

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Dan @danj 声誉积分: 479.6千 Self employed contract worker 35 329 971 · Answer 1 · 2023-07-07T10:41:24-07:00

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Dan @danj

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发帖于: 2023年7月7日

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Your system has two graphic services! When you boot up under Safe mode and the screen is working tells us the second GPU has failed! That’s the Radeon Pro 560 GPU. Sadly this will need a new logic board or someone with the deeper skills to replace the GPU chip (brain surgery!)

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Thanks Dan. Is there a way to definitively find out if it's the GPU?

I have the Radeon Pro 555 (2gb).

由 Dmak 完成的 2023年7月8日

@dmak13718 - If the display is working in Safe Mode or under diagnostics we can deduce the display is not the problem. That only leaves the Intel Graphics services or the Radeon dedicated GPU (555 or 560]. And it’s clear the Intel graphics is working here.

由 Dan 完成的 2023年7月8日

Alright, thanks for your help Dan.

由 Dmak 完成的 2023年7月10日

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iMac Intel 21.5" Retina 4K Display (2017)

Black screen during boot

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