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Since multiple issues can lead to the error, most users do not know how to start the repair.

Let's see details.ĥ Solutions That May Help You Get out of Missing Operating System Error Fortunately, for each cause we have the corresponding solution.

If one or more of these 5 issues are true, users will receive the disturbing error message Missing Operating System or Operating System not Found.

The partition which saves Windows boot files is no longer active or users set wrong partition active.

Windows Master Boot Record (MBR) located on the hard drive is damaged or corrupted.

Users make improper or incorrect BIOS settings.

The hard disk failed either physically or logically.

The basic input/output system (BIOS) does not detect the hard disk that installs Windows.

In general, both hardware issues and software failures can make an operating system not found, and here we mainly list the following 5: 5 Causes That Lead to Operating System Missing Tip: Depending on the BIOS used by system, the error message could also be " Operating System not Found".