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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. Here are the detailed steps you can follow:

In case of this, you may first check the BIOS settings and see if the OS hard drive is set as the Boot drive. When non system disk or disk error occurs on the computer, BIOS settings won't be able to detect and load the operating system, then your computer won't be able to boot up. Check If the Hard Drive Is Detected by BIOS 7 Solutions to Fix Mising Operating System or OS Not Found ErrorĪfter 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. Continue reading and you'll get fixes to fix operating system not found error instantly. So how could you get rid of this error, making computer detect the operating system and boot up successfully again? Here is what's we intent to help in the next part. 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 found 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.