BOOTMGR is missing
Press Ctrl+Alt+Del to restart
What it means
The PC tried to start from a drive that has no Windows boot manager on it.
Common causes
- A USB stick or second drive is first in the boot order
- A damaged boot partition
How to fix it
- Remove USB sticks, discs and memory cards and restart.
- In the BIOS, set the Windows drive first in the boot order.
- Run Startup Repair from a Windows USB stick.