Step 2: Release F12/F10 when the BIOS Setup Utility is displayed. Step 1: Press and hold 'F12/F10' while pressing the 'Power' button to turn on the PC. Check if the hard drive is detected by BIOS Note: If the BIOS fails to detect the operating system, you will receive one of the following error messages, which tells the same problem on different operating system versions.Įrror message 1: Missing Operating SystemĮrror message 2: Operating system not foundħ Solutions to Fix Operating System Not Found or MissingĪfter knowing the causes for an operating system not found or missing in Windows, now it's time to apply effective solutions to restore the missing operating system. An incompatible partition is set as active.Windows Master Boot Record (MBR) is corrupt/damaged.The basic input/output system (BIOS) does not detect the hard disk.To be specific, the causes that lead to Operating System Not Found are as follows. Generally, when something goes wrong with the BIOS configuration, hard drive health, or the Master Boot Record (MBR), you can't boot the Windows and will see the mentioned two error messages. Full stepsĬauses of Missing Operating System/Operating System Not Found Full stepsīoot PC from EaseUS Partition Master. Full stepsįind BIOS and enable the default setup option.
