No more Mac partition at startup

Hi, iMac with Mac and Windows OS. Mac default startup. After updating Windows latest updates the Mac partition is not longer showing at startup, but Windows only. Even from Boot Camp, Restart in macOS does not work, it always restarts on Windows. What may have happened? How to fix it?

iMac Pro

Posted on May 18, 2021 12:59 PM

Similar questions

Mac Os partition does not show up at startup after resizing Windows partition I have Mac Os Catalina . I recently installed Bootcamp and made a Windows 10 partition . Everything worked fine and I could switch between partitions fine on startup using option key. Until one day I decided to resize / expand my windows partition using a third party software by shrinking my mac os partition and using the free space to increase my windows partition. Now the only partition I see on start up is Windows Bootcamp and when I go into Disk Utility my mac os partition has “unknown” format and looks like this Please help me fix this
1483 8
Mac os partition does not show up at startup after resizing Windows partition I have Mac Os Catalina . I recently installed Bootcamp and made a Windows 10 partition . Everything worked fine and I could switch between partitions fine on startup using option key. Until one day I decided to resize / expand my windows partition using a third party software by shrinking my mac os partition and using the free space to increase my windows partition. Now the only partition I see on start up is Windows Bootcamp and when I go into Disk Utility my mac os partition has “unknown” format and looks like this Please help me fix this
836 4
Bootcamp partition can't be detected after reinstalled MacOS I reinstalled Mac OS about a month ago, and I found that there is no bootcamp in system preferences->startup disk. Boot camp assistant also does not recognize the partition and gave me an error "the startup disk cannot be partitioned or restored to a single partition". So I'm not able to remove the bootcamp partition either. How can I fix it?
1185 1

2 replies

loredana156 Author

Level 1

4 points

May 18, 2021 1:08 PM in response to loredana156

Never mind. I just tried to unplug the computer power cord and plug it back, and the Mac OS is back on running now. Both partitions now showing at startup. Thank you, anyway :)

Loner T

Level 9

59,536 points

May 18, 2021 2:54 PM in response to loredana156

Excellent!

This thread has been closed by the system or the community team. You may vote for any posts you find helpful, or search the Community for additional answers.

No more Mac partition at startup

Welcome to Apple Support Community

A forum where Apple customers help each other with their products. Get started with your Apple Account.

Learn more Sign up