As my XPS 13 cannot upgrade higher than Windows 10 (delivered with windows 7 Pro installed), I want to continue to the computer by installing LinuxMint. It runs perfectly booting from a USB-drive and here after completting the installation on the computer. But when booting after installation,  after taking the usb-drive off I always get “Operatiion System not found” on the back screen.

I’m using the default settings in the BIOS version A07

If I start up again using the usd-drive with the LinuxMint installable, I return in the end with the same result.

How do I get out of this loop and get a real bootable installation from the harddrive?