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Follow the guidelines below to resolve the following error message: The No boot device Found error appears when the Boot Sequence is set to Legacy mode or the operating system is installed under Legacy mode. No boot device found error The following error may appear after operating system installation: No boot device found . This error occurs when the device BIOS boot sequence is set to Legacy mode. If the operating system is installed in Legacy mode, the error message appears when you reboot the computer. The failure cannot be recovered by changing the BIOS setting back to Unified Extensible Firmware Interface (UEFI). The operating system should be reinstalled. Note: Only Windows 10 and higher and Linux operating systems in UEFI boot mode are supported on these specific Dell computers. Ensure that UEFI mode is enabled in the BIOS before trying to reinstall the operating system. Using an Optical Drive to install the operating system is not supported in legacy mode as there is no Optical Drive option in the Boot Menu. The above Dell computers have a 7th-generation Coffee Lake processor (and above). The computers are designed to boot exclusively in the UEFI; boot environment. As a result, the operating system fails to boot if Legacy boot mode is selected on these computers.
Wrong boot mode set in BIOS.
If the operating system is installed with UEFI before the boot sequence is changed, the computer can be recovered by changing the Boot sequence back to UEFI. If the operating system is installed with Legacy mode, the computer cannot be recovered by changing the Boot sequence back to UEFI mode. Operating system reinstallation should be performed. Follow the steps below to reinstall Windows 10 or higher: From a power off state, power on the computer and Press F2 at the Dell logo to boot into the BIOS setup menu. Choose Boot sequence and change the option from Legacy to UEFI then click Apply in the lower right corner of the screen: Choose Advanced Boot Options and disable Enable Legacy Option ROMs then click Apply in the lower right corner of the screen: Choose Secure Boot -> Secure Boot Enable and change the option from Disabled to Enabled . Then click Apply in the lower right corner of the screen: Click Exit in the lower right corner of the screen and wait for the computer to reboot. Reinstall the Windows 10 operating system. Follow the steps below to install the Linux operating system: Follow steps 1 through 3 from the steps above for installing Windows 10 (these steps are the same for a Linux install). Verify the Secure Boot > Secure Boot Enable option is Disabled in the BIOS: Choose SATA Operation -> SATA Operation and change to AHCI mode: Click Exit in the lower right corner and wait for the computer to reboot. Reinstall the Linux operating system. See Dell Knowledge Base articles for more information: How to Enable Boot from CD or DVD Option with UEFI Boot Mode Enabled No Boot Device Found When You Change the Boot Sequence to Legacy Mode
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