The boot partition/system partition needs to be set as active when Windows is operating in Legacy BIOS + MBR mode so that MBR can pass boot directly to the boot manager and locate Windows. Restart the computer when you've ejected the Windows Setup DVD.It is a safe method of recovering data when you can't find the operating system on Windows and thus can't access hard drives. Using an advanced data recovery tool like Remo Recover is one of the best ways to backup or recover data that is inaccessible due to these hard drive issues. Try the following solutions to fix the issue, but before you do, make sure you have a backup of your data because changing the system configuration can occasionally result in data loss. The Master Boot Record (MBR) is corrupt.Įxcept for these causes, the Operating System can go missing due to improper handling of hard drives, frequently running of the system through updates, and also due to physical damage to the hard drive.The error might also be due to Improper BIOS settings.The hard drive is not getting detected by the basic input/output system (BIOS).To be more precise, the causes of missing Operating System in laptop or computer are as follows: You won't be able to boot the Windows system when something goes wrong with the BIOS setup, hard drive health, or the Master Boot Record (MBR). Let us first discuss what are the major causes why Operating Systems go missing on Windows computers. The methods in this article can be used to fix issues on Windows 11, Windows 10, 8.1, 7, Windows XP, and Windows Vista. In this article, you can find out why your computer says "operating system not found" and simple remedies to solve the missing operating system error on computers such as Levono, HP, Dell, Toshiba, Asus, and many more. Setup did not find any hard drives installed on your computer.Īlthough these errors are common, it takes a lot of time and effort to fix them.The "Operating System not found" error messages are common if you are a Windows user and you often reinstall the operating system to improve computer speed and performance. What to Do if you still can’t fix the Missing Operating System Error?. ![]() ![]() Rebuild Master Boot Record with the installation CD/DVD Check If Your Hard Drive is Detected by BIOS
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