question

Reboot the server in safe mode. You should be able to logon with the default administrator account, even if you disabled it. Then re-enable it and reboot to normal mode.

Enabling safe mode in 2012:
boot using a Windows Server install DVD or USB, and select REPAIR YOUR COMPUTER, then Troubleshooting, then Command Prompt

then:

bcdedit /set {bootmgr} displaybootmenu yes
bcdedit /set {bootmgr} timeout 10

Reboot your machine, pressing F8 and SAFE MODE

QnA currently supports the products listed here (more to be added) Better to reach out to subject matter experts in dedicated forums over here.

https://social.technet.microsoft.com/Forums/windowsserver/en-US/home?forum=winserver8gen

--please don't forget to Accept as answer if the reply is helpful--

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Regards, Dave Patrick ....
Microsoft Certified Professional
Microsoft MVP [Windows Server] Datacenter Management

Disclaimer: This posting is provided "AS IS" with no warranties or guarantees, and confers no rights.

Hello Arjan,

When i try to boot using a Windows Server install using USB, and select REPAIR YOUR COMPUTER, then Troubleshooting, then Command Prompt , it requires to login first so that it can display the command prompt.

Kindly help on how to bypass this.

Joseph M