On rare occasions when you turn your computer on you will be greeted with a Secure Boot error followed by the message "No boot device found" If you go into the UEFI and disable Secure Boot the system boots up just fine. Below is a method I found online to fix the issue Disable Secure Boot and boot into Windows (If Bitlocker is enable you'll have to go to https://aka.ms/myrecoverykey on another device to find your bitlocker recovery key). Find a flash drive and make sure