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Model A1312 / Mid 2011 / 2.7 & 3.1 GHz Core i5 or 3.4 GHz Core i7 Processor, ID iMac12,2

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Gray Screen with apple logo and progress bar

I'm working on an iMac running High Sierra 10.13.4 that won't boot. It goes to a gray screen with the Apple logo and a progress bar underneath. The progress bar reaches the end after about 20-30 minutes of booting, but then freezes there indefinitely. I've looked online for some solutions and here's what I've found:

  • Reset NVRAM
  • Reset PRAM
  • Reset SMC (several times)
  • Ran hardware diagnostics - No issues found
  • Booted into single user mode & ran /sbin/fsck -fy command - first run found & fixed drive errors, second run said it was OK
  • Tried to restore from Time Machine - unable to find any restore points.
  • Ran a reinstall of the OS over internet and from USB drive - it seems to have reinstalled OK each time, but after a reboot I get the gray screen with the progress bar again.
  • Tried booting from a USB stick but it keeps saying it is unable to load the OS. Reformatted the USB stick & tried again 3 times with the same result.

I'd appreciate any help. Thanks.

Update (06/07/2018)

Thanks for the input! As it turned out, the issue appeared to be a corrupt OS. I completely formatted my USB drive via the Disk Utility on my other Mac:

https://www.howtogeek.com/255251/how-to-...

I then downloaded the High Sierra OS from the app store. When that was done, I copied it over and made my USB drive bootable using the command:

sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/untitled --applicationpath /Applications/Install\ macOS\ High\ Sierra.app

...where "untitled" was the default name given to my USB drive after formatting it.

When I tried to do the reinstall from the USB before, I used a 3rd party utility to format & install the OS installation files on the USB drive. Obviously, it didn't work properly.

The reinstall I performed appeared to just fix the OS; it didn't format the HD & reinstall a fresh copy. Now, I just got a call from the customer again today saying it's doing the same thing as before. He's only had it a couple days. I may have to do a full wipe & reload.

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Do you have a second Mac which you can connect back to back using Target Disk Mode?

How to use target disk mode to move files to another computer

After salvaging anything important wipe the drive (reformatting) and reinstall the OS from your other system.

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Try Dan's answer to see it you can extract anything. We've been seeing a ton of these in the shop. Most likely your GPU is shot. The 2011 iMacs are notorious for cooked GPU's. One sure test is to see if your computer will boot to an external drive or Operating system install disk.

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When I run the built-in hardware diagnostic software it didn't detect any problems. Does this diagnostic not accurately detect GPU problems? I'll try the external boot idea.

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The built in diagnostic is useless. Try the external boot! If you can run an OS via USB then it's a separate issue and most likely a drive/internal OS issue.

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Chris Hiepler zal eeuwig dankbaar zijn.
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