Unmark server 2003 active partition

Be cautious when you are operating partitions, for mistaken manipulations will cause unexpected troubles. Here is an example: one of my friends told me that he marked a partition not C drive as active when he was managing partitions. Then, he suffered from system boot failure the next morning and received the error message: "NTLDR is missing" and "Press Ctrl + Alt + Del to restart". Lacking professional software knowledge, he could not find out the exact reason. Is there any way to unmark Windows Server 2003 active partition?  

What Causes Boot Failure after Marking Partition Active

Providing that the partition marked as active does not contain Windows boot files or the boot files for another operating system, users may come across system boot failure or get error information due to the very precondition of using Intel-based computers: the system partition must be a primary partition that has been marked as active for startup proposes. Moreover, the partition must be situated in the disk that the computer gains access to at startup, and only one active system partition is allowed to be marked at a time. Marking corresponding system partition as active before restarting the computer is the precondition of using another operating system.  

Deactivate an Active Partition with MiniTool

As Windows built-in Disk Management tool and "Diskpart" command line do not work in non-booting system, users need to find other ways to unmark active partition. Here, an excellent way – using third party server partition manager is highly recommended for users. At this time, the selection of software becomes a burning concern, and highly qualified MiniTool Partition Wizard Server Edition is of high recommendation. And the detailed operational steps to deactivate a partition for Windows Server 2003 Virtual VMware are demonstrated below:   Operating-system-boot-failure   1. The picture above is the startup interface of computer failing to successfully boot from local drive. After launching the Virtual VMware, users are supposed to click the back triangle under "Power This Virtual Machine" tab on the upper left corner and then click "Power On to BIOS"   Main-console-of-BIOS   2. In this interface, choose "Boot" option and then choose "CD-ROM Drive"(here, users can choose according to actual situation. If the boot files are burnt to removable devices such as USB drive, users can choose the "Removable Devices" option. It applies to the other two options). Then, click "F10" and "Yes" to continue.   Boot-from-chosen-boot-media   3. After those operations, users will get the picture above. As operating system fails to boot from local drive (system partition is deactivated), users are recommended to choose the first one to continue:   Choose-display-resolution   4. In this interface, choose "1" which is set by default to get the main interface of server partition management software shown below:   Main-interface-of-bootable-server-partition-magic   5. In the main interface of MiniTool Partition Wizard Server Edition, choose the system partition from disk mapping area (here, the partition sized to 39.99 GB is the target partition) and then click "Set Active" from left action panel.   Apply-partition-activation-effect-to-system-partition   6. At this time, click "Apply" button in the upper left corner to make final confirmation. When the software performs all those operations, users can exit the software and try to reboot the operating system from local drive, for it has been repaired. After entering the system, users will find that the partition which was set as active by mistake is in primary, while the system partition: C drive now becomes active.   The recommended server partition manager performs partition deactivation within a few steps. If same or similar situations happen, please try professional MiniTool Partition Wizard Server Edition to improve them.