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Activity Forums Apple OS X Mac iOS Sequoia 15.5 will not fully install on iMac Pro 2017

  • Mac iOS Sequoia 15.5 will not fully install on iMac Pro 2017

    Posted by Leonard Frankford on May 19, 2025 at 12:51 am

    I do my Adobe Premiere Pro editing on an iMac Pro 2017. I have had no problems updating each iteration of Sequoia 15.x Just updated to 15.5 and it seems to have fried my computer. Apple says iMac Pro 2017 is supported. It will not do a complete install. I am able to get into Recovery mode, reinstall Sequoia, seems to install, then it still brings me back to a page to install. When I either Restart or Shutdown/start, I get a white progress bar up to about 90%, and then it freezes. I can only boot it in Safe Mode, which means no audio and no editing. I don’t have a Time Machine so no going back. Anyone else updated to 15.5 on iMac Pro 2017? Issues? Thank you.

    Ben Balser replied 4 months ago 2 Members · 1 Reply
  • 1 Reply
  • Ben Balser

    January 16, 2026 at 5:38 pm

    This is super rare to have a macOS update go wrong. I’d contact Apple support. Maybe run it to a local Apple Store to have them check it out. Could be a hardware issue.

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