bcdboot D:\Windows /l en-us /s D: /f ALL
If you have followed this guide and your server still does not boot normally, you may need to seek further assistance from Microsoft support or a qualified system administrator. Additionally, if you have made any recent changes to your server configuration, you may want to consider restoring from a backup or reversing those changes. windows server 2012 r2 boot repair
These videos demonstrate how to access and use the Windows Recovery Environment for boot repairs: bcdboot D:\Windows /l en-us /s D: /f ALL
Boot repair is often a reactive measure. To minimize downtime: windows server 2012 r2 boot repair