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.
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