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dual boot - boot loader not always loaded
Hello!
I got a problem with my Windows 10 / Windows 7 dual boot system.
The boot loader does not come up every time. It depends on what I did before.
Shut down Windows 10 -> boot loader does not show up on next boot and Windows 10 boots up.
Reboot Windows 10 -> boot loader shows up and I can choose which OS to start.
Shut down Windows 7 -> boot loader shows up and I can choose which OS to start.
Reboot Windows 7 -> boot loader shows up and I can choose which OS to start.
Of course I want the boot loader to show up every time.
What I did:
Windows 10 was preinstalled. Then I reduced the partition size of Windows 10 and created another primary partition for Windows 7. Windows 7 was then installed in this new partition.
Does anyone know what causes this behavior?
Thanks in advance