When you are prompted to enable large disk support, click Yes. At the command prompt, type fdisk, and then press ENTER. Boot to a command prompt by using a Microsoft Windows 95, Microsoft Windows 98, or Microsoft Windows Millennium Edition (Me) boot floppy disk. Try changing the active partition by booting to a floppy disk and then using disk utilities to manually change the active partition: To resolve this behavior, use one of the following procedures: Resolutionīefore performing the steps listed below, make sure that you have a good backup of your critical data files. If you want to use another operating system, you must first mark its system partition as active before restarting the computer. There can be only one active system partition at a time. This partition must be located on the disk that the computer gains access to at startup. 
On Intel-based computers, the system partition must be a primary partition that has been marked as active for startup purposes. This behavior occurs if the partition marked as active does not contain the Windows boot files or the boot files for another operating system. This article provides a solution to an issue where the computer doesn't start after you mark your primary partition as active.Īpplies to: Windows Server 2012 R2 Original KB number: 315261 SymptomsĪfter you use the Windows Disk Management snap-in tool to mark your primary partition as active, the computer may not start, and you may receive the following error message: The computer does not start after you change the active partition by using the Disk Management tool
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