Access the Boot Options option and check the Safe Boot option, then select OK .
Restart your system so that the configuration is applied on your Windows Server 2012 system.
Press Windows + C key combination to open Settings.
Click on Power , press and hold the Shift key, then click Restart .
Wait until the popup window appears, and click on Troubleshoot .
Click to select the Advanced Options option.
Click on Startup Settings .
Click Restart.
On the Advanced Boot Options popup window, select Safe Mode and then start your Windows Server 2012 in Safe Mode.
Press Windows + C key combination then click Start to open Start Screen.
Right-click on Start Screen and select All apps .
Right-click the Command Prompt and select Run As Administrator .
Select Yes .
Enter Bcdedit / set {bootmgr} displaybootmenu yes into the Command Prompt window and press Enter .
If you do not want to be prompted to enter the option at startup, change Yes to No.
Once completed, restart your computer, then press F8 to open the boot process setup window, then press F4 or 4 to boot in Safe Mode.
Good luck!