JSI Tip 4983. Your computer doesn't start after you mark the primary partition active using Disk Management?

Microsoft Knowledge Base Article 315261 contains the following Description:

After 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: NTLDR is missing. Press Ctrl+Alt+Del to restart. This behavior occurs if...

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