Often times, the 'BOOTMGR is Missing' error will appear if your PC is trying to boot to a non-bootable disc, external drive, or floppy disk. The BOOTMGR error could be a fluke.Ĭheck your optical drives, USB ports, and floppy drives for media. When you are in your bios, what boot options do you show? Was it plugged in while you were trying to change drives?ĭo you have a backup Image of your system? If you could explain what, if anything, you did to the original drive, it might also be helpful. If it is telling you there is no OS installed, try ignoring that message and go the the next step. If you are running Startup Repair from this option, you should be able to run it 3 times and recover your system. You can then run some commands to help get your system back. Since you seem to be able to get into the Recovery mode, you can get to a command prompt from there. A picture would give us more info and a camera works well for that and attach using the paperclip on the advanced replies.ĭo you have a Windows 7 Install DVD or Flash drive you are booting to? If not, what are you booting to? It would be helpful if you could get a picture of your partitions using a third party bootable partition manager like Partition Wizard, or booting into a command prompt and using diskpart to list the partitions on the drive. I am not sure what might have happened during your trial of using another hard drive. This would be more likely if the machine was a couple of years old. Since you are running Windows 7, I will assume you have a Legacy (MBR) install. If I understand correctly, you now only have the original hard drive in the system.

Windows 7 bootmgr is missing fix