Insert a bootable device with a copy of Windows in your system and click on Repair your computer present at the bottom left side of the screen. Once in the recovery environment, click on Troubleshoot > Advanced options > Command prompt. Once in the command prompt, execute the following command: bootrec /rebuildbcd.. Report abuse. Then you need to look at how you created your Linux bootable USB key. A failure to boot would have nothing to do with Windows. The message is generated by the BIOS not by the operating system. See if your chosen Linux distro has its own support forum. A. User.

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After using that to format my USB drive properly and then put the ISO on the drive, I restarted and entered the boot menu via the POST screen. I selected USB-HDD and it restarted as usual. But after POST it came up with the message "Missing Operating System" on a black screen.. After a manual reboot the Yellow is online again but all connected USB devices are missing. When rebooting several times it seems there is a 50:50 chance it boots at all and if it boots, USB is missing. Downgrade to 12.2 solves the issue. What operating system image do you use? yellow (Home Assistant Yellow)