Insert the (or USB) and restart the server. Press any key when prompted to boot from CD or DVD . Select your language and keyboard layout, then click Next . Click Repair your computer in the bottom-left corner.
: Go to Troubleshoot > Advanced options . From here, you can select Startup Repair or Command Prompt . 2. Automated Startup Repair windows server 2012 r2 boot repair
bootrec /fixboot
The server still wouldn't budge. Alex suspected the BCD file was so mangled that rebuildbcd couldn't overwrite it. He decided to manually "reset" the BCD: Insert the (or USB) and restart the server