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Model A1419 / Late 2013 / 3.2 & 3.4 GHz Core i5 or 3.5 GHz Core i7 Processor, ID iMac14,2

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Mac partition corrupt and can't boot into Recovery Mode

I have a dual boot late 2013 iMac which i bought in November 2014.. A few months ago I was playing a video game on the Mac partition with the Mojave OS and suddenly the graphics got distorted and pixelated and the Mac froze.

Ever since then it won’t boot on the Mac partition. The Windows 10 partition works great but when I try to boot into the Mac partition the progress bar under the white Apple logo stops at about 70% and never progresses. The recovery partition appears to be corrupt, even when connected directly to my router it shows the globe icon spinning and does a 3 minute countdown but then goes into the White Mac logo with the progress bar that stops at 70%. It doesn’t present any recovery or Disk Utility options, just switches back to trying to boot into the Mac partition.

I am wondering if some of the video circuitry failed (among other things) as when I went to install the video game (Insurgency) on the Windows 10 partition after the Mac partition failure it gave a graphics hardware error message, which of course I can’t remember the details of the error. But it didn’t give that error message when I had installed Insurgency on the Windows 10 partition in the past, before the Mac partition failure.

And I can’t boot from my Time Machine external drive, it stops at the same 70% progress bar.

Any suggestions? I would back up my Windows partition and do a complete low-level format of the whole hard drive but I don’t know how I could do that without a recovery partition or bootable media.

thankyou

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Are you pressing the Option key when you boot your system so you get to the Startup Disk Manager?

Reference: Mac startup key combinations

par

@danj Yes, holding down Option only presents me with the option to boot into the Windows partition or the Macintosh partition (which stalls at 70%). Holding down Option-R presents the rotating globe icon and a 3 minute countdown, and then the Mac automatically tries to boot into the Mac partition, which of course stalls again. I am getting no recovery or disk utility options, just this same loop.

par

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Normally I would have recommended running the onboard diagnostics but Apple messed it up under Mojave so I don’t think it will ofter anything useful. Restarting the system and pressing the D key (see the reference above). To rule out a bad GPU you’ll need to visit an Apple Store as their diagnostics still work, go figure! ;-{

The other approach:

Without knowing via diagnostics you’ll need to take the long path here hoping you just have a OS corruption. You’ll need to create a bootable OS installer thumb drive so you can see if you can boot under it.

While possible to do in within your Windows partition I would recommend using a Mac as its easier and quicker. Here’s the easy steps:

First you’ll need a clean image download the image from here: How to upgrade to macOS Mojave. Jump down to Step 4 for the link. Apples certificates expired on anything older If you've got an old macOS install image, it will probably stop working today

Next, follow this guide: How to create a bootable macOS Mojave installer drive

To do this within Windows here’s how: Prepare Bootable USB Of macOS Mojave On Windows 10 PC

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Thank you very much for your info. I held down D and the Apple diagnostics found nothing wrong. I’m going to try your suggestions for a reimage. Thanks again for the advice and taking the time.

par

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