Safe Mode on Windows provides access to special features that can be used to fix various kinds of problems. To boot in safe mode, you will need to have regular access to your Windows server. There will be two ways to configure this, use any of them to boot the server in safe mode.
Method # 1. Using launch options
To enable safe mode using the graphical interface, you must press the key combination from: Windows + C to open “Settings”, then click on “Power”. After that, click on Shift and then “Restart”. Click Troubleshoot, then Launch Options. Click “Restart” after “Enable safe mode” is displayed in the displayed list.
Use the arrow keys to enter safe mode. After you press Enter, in safe mode, your Windows Server will boot into unopened mode.
After successful inclusion of safe mode, your background should be black, and in the upper right corner on your desktop will appear the inscription “Safe mode“
Method # 2. Using msconfig
In order to boot into safe mode using the system (msconfig), you must go to Run and run msconfig
On the Download tab, which is located in the Download Options, select Secure Download. Then click “OK”, and the server will automatically restart in safe mode. If you are prompted to “Restart,” click OK.
When loading in safe mode, the background of the desktop will be black, and in the upper right corner of the desktop will appear the inscription “Safe Mode“
Also, we offer you to get acquainted with additional information, which is displayed on the link below:
https://social.technet.microsoft.com/Forums/ru-RU/b2aa05d4-e93d-41dd-ae5e-a93902296188/where-has-server-2012-safe-mode-gone-startup-settings-missing-too? forum = winserver8gen