Disable a Windows 2008 or Windows 2012 Server Boot (old boot.ini)
Disable a Windows 2008 or Windows 2012 Server Boot (old boot.ini) 1) Unjoin the domain 2) Command prompt as administrator in \windows\system32 folder 3) bcdedit /deletevalue {bootmgr} device 4) bcdedit /deletevalue {current} device 5) Reboot