Thank you in advance for any useful hints. After login I get a totally black screen or one with a spinning wheel. I have tried the following things. Zap nvram Smc reset Deleted as single user login peers. Start as another user that was installed for migration Verbose mode... too fast to read and ends up in the same thing

Did try shift ore safe mode.. same result. Shift makes No difference to the boot process

Started into recovery mode which doesn't want to let me repair my disk. The stupid High Sierra installation made it encrypted. Can't remember that it asked me.. it was certainly not that I wanted it.

I had restarted because Lightroom kept crashing

I have been struggling for 8 hours now and I am at wits end

NO. there is no other working mac and internet installationis not possible because I am on a 3g phone line in rural Costa Rica

There is only 1 thing that works.. the useless guest login boot into Safari mode

2 Answers 2


You could try creating a new user account by tricking the computer to going through the initial setup process.

Instructions on re-running Apple Setup Assistant

By creating a new user this way you can check that the issue is specific to your user account, and not your installation of macOS. If this account can login you could copy the files from the other user and the issue is resolved.

If not then you need to find a better internet connection and reinstall, someone could download the files onto a USB stick for you perhaps?

  • Unfortunately thé browser eats Line feeds on m'y Phone... I already had another user for emergencies.. Feb 25, 2018 at 15:16
  • Sorry I don't understand what this has to do with anything? Feb 25, 2018 at 15:18
  • Same thing.. the line completes to 75% then I get the black screen. Feb 25, 2018 at 15:19
  • What line completes, the issue with your Mac not the iPhone? Feb 25, 2018 at 15:20
  • Can the system be downloaded from a Windows computer? It takes about 13 hours here but maybe a friend could try while he is on a long trip with his truck. The problem is I REALLY need to use my computer Feb 25, 2018 at 15:21

Try reinstalling MacOS to see if the new system files fix the issue.

Start up from macOS Recovery

  1. Turn on or restart your Mac, then immediately hold down Command (⌘) + R.

  2. Release the keys when you see the Apple logo or a spinning globe.

  3. When you see the macOS Utilities window, continue to the next section to determine whether to erase your startup disk or begin installing macOS.

Install macOS

Follow these steps after starting up from macOS Recovery:

  1. Choose Reinstall macOS (or Reinstall OS X) from the utilities window.

  2. Click Continue, then follow the onscreen instructions. You'll be asked to select your disk. If you don't see it, click Show All Disks. To verify eligibility to install macOS, your Mac serial number is sent to Apple, and you might be asked for your Apple ID.

  3. Click Install. Your Mac restarts after installation is complete.

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .