Démarrer à partir de Lan

Thank you

and I receive a message "PXE-51: No DHCP or proxy DHCP" and nothing works, it gives me boot failure insert disc!

help me, please

Hi!
Go into your BIOS, enable "Boot from network," then go to the BOOT options and set the network (or network card) as the first option (sometimes you need to restart the BIOS for it to appear in the BOOT options). If you followed my instructions correctly, your computer will now boot from the network first. When it boots from the network, press control + alt and hold both buttons down so that it connects to your network. After that, follow the instructions.