![mac boots to prohibitory sign mac os utilities screen mac boots to prohibitory sign mac os utilities screen](https://iboysoft.com/images/resource/use-first-aid-to-fix-disk-issues.jpg)
- #MAC BOOTS TO PROHIBITORY SIGN MAC OS UTILITIES SCREEN INSTALL#
- #MAC BOOTS TO PROHIBITORY SIGN MAC OS UTILITIES SCREEN PASSWORD#
external storage/HD of the functional Mac) to the internal Mac drive. In Setup Assistant, migrate your data from the source disk (i.e. I did everything From zapping the PRAM to repairing disk. Once the installation is over, Mac automatically restarts and boots from the Startup Disk. I didnt know what to think about it, so I tried a few fixes. I don't think APFS has been tested all that well and the tools that can potentially find issues with it, don't seem to work that well - since everything reported back as being fine, when in reality it wasn't. After I installed Snow Leopard, I turned on my Mac to find that the nice Apple logo had changed to a prohibitory sign (with a slash through it). I'll be waiting for 10.13.2 or 10.13.3 before I even think about upgrading this machine again.
#MAC BOOTS TO PROHIBITORY SIGN MAC OS UTILITIES SCREEN INSTALL#
The genius bar ended up performing a fresh install of Sierra (10.12.6) on this machine and it's been fine ever since. When doing the upgrade, the recovery mode to install a fresh macOS is also updated, so there's no way to go back unless you have the media for an older OS or go to the genius bar - they can boot virtually any macOS version from across their network. In my case, I choose to use APFS (Encrypted). This leads me to believe there is something wrong with APFS, which is mandatory for SSD's (something we both have in common). Prohibitory symbol remained and would occasionally boot-up after going into recovery mode. Hold those keys down until your Mac reboots again and you hear the startup chime for the second time. You have to make sure you press these keys before the gray screen appears or it won’t work. Follow these steps to Safe Boot your M1 Mac or newer: Press and continue to hold the power button until you see the startup options appear.
![mac boots to prohibitory sign mac os utilities screen mac boots to prohibitory sign mac os utilities screen](https://i.stack.imgur.com/JHdlt.jpg)
I took the machine to the genius bar and they confirmed the filesystem and hardware were performing normally. Press the power button and then press the command option P R keys.
![mac boots to prohibitory sign mac os utilities screen mac boots to prohibitory sign mac os utilities screen](https://cdn.osxdaily.com/wp-content/uploads/2018/09/install-macos-mojave-screen-610x474.jpg)
Not only did I have this problem after an upgrade, but about a week after doing a fresh install of High Sierra on this machine, the same thing happened again.
#MAC BOOTS TO PROHIBITORY SIGN MAC OS UTILITIES SCREEN PASSWORD#
If youre asked to select a user you know the password for, select the user, click Next, then enter their administrator password. When starting your Mac, if you run into a prohibitory sign and the system will not boot, there are a couple of things you can try to address the problem. I also had this problem - on a 2016 MBP with touchbar. Managing a prohibitory sign at OS X bootup.