Hello Mo_h88,
Thank you for using Apple Support Communities.
I understand that after an error during the install of macOS High Sierra, you are not able to log in to your computer. You say you have tried restarting in safe mode unsuccessfully and that you have tried to reinstall the software, with no success.
I would first recommend that you run Disk Utility to search for and repair any issues with your drive. The following link will walk you through running Disk Utility:
Disk Utility Help
Once that has been done and if you are still not able to boot your computer, I would follow the steps in the following article to reinstall macOS High Sierra. I recommond selecting NOT to erase your startup disk.
How to reinstall macOS
Best regards.
Thank you for using Apple Support Communities.
I understand that after an error during the install of macOS High Sierra, you are not able to log in to your computer. You say you have tried restarting in safe mode unsuccessfully and that you have tried to reinstall the software, with no success.
I would first recommend that you run Disk Utility to search for and repair any issues with your drive. The following link will walk you through running Disk Utility:
Disk Utility Help
Once that has been done and if you are still not able to boot your computer, I would follow the steps in the following article to reinstall macOS High Sierra. I recommond selecting NOT to erase your startup disk.
How to reinstall macOS
Best regards.