Step 2. Then, select "Set Active" from the drop-down menu. The software will automatically execute the operation and create an active partition for you. All effective solutions to the "Missing Operating System" or "Operating system not found" error are carefully presented on this page. You may try any one of the methods to resolve the issue and get a healthy Windows system back and continue using your computer again.
Gemma is member of EaseUS team and has been committed to creating valuable content in fields about file recovery, partition management, and data backup etc for many years. She loves to help users solve various types of computer related issues. Daisy is the Senior editor of the writing team for EaseUS. She has been working in EaseUS for over ten years, starting from a technical writer to a team leader of the content group.
As a professional author for over 10 years, she writes a lot to help people overcome their tech troubles. It makes it way easier to play out what will happen after you've made all the changes. I also think the overall look and feel of EaseUS Partition Master Free makes whatever you're doing with your computer's partitions easy. Partition Master Free can Resize, Move, Merge, Migrate, and Copy disks or partitions; convert to local, change label, defragment, check and explore partition; and much more.
Warning This command can damage your partition table if a virus is present or if a hardware problem exists. If you use this command, you may create inaccessible partitions.
We recommend that you run antivirus software before you use this command. We also recommend that you backup your data before you use this command. If the fixmbr command detects an invalid or non-standard partition table signature, the fixmbr command prompts you for permission before rewriting the MBR.
The fixmbr command is supported only on xbased computers. For more information about Recovery Console, click the following article numbers to view the articles in the Microsoft Knowledge Base:. For more information about how to troubleshoot startup problems in Windows XP, click the following article number to view the article in the Microsoft Knowledge Base:. Setup did not find any hard drives installed on your computer. Need more help? Expand your skills.
Get new features first. You may solve the problem by reverting the BIOS settings to default. Thankfully you can access the command prompt within the Windows repair settings.
Using this you will rebuild the boot file and fix the master boot record. This method also allows you to complete this process without using installation media, which you may or may not have. Warning: Microsoft recommends running antivirus software before using this command. If a virus is present in the system, this command could damage the partition table by creating inaccessible partitions.
As always, any hard drive work should be backed up first. Now that the MBR has been repaired you can use the Command Prompt again to navigate to the correct partition and mark it as active. This will solve the problem of the wrong partition being marked. Thankfully, none of these solutions are very difficult. If your hard drive is failing, make sure to research before buying a new hard drive. Save my name, email, and website in this browser for the next time I comment. Home Fix Learn About.
Detailed steps are as follows:. Start computer and press a specified key to enter BIOS. Usually it is F2, F10, Del…However, different computers or motherboards require different keys, so you'd better search on the internet or you can consult your computer manufacturer to get the correct key. At this time, different users should take different measures. If you are capable of taking out hard disk and then connecting it correctly, please quit from BIOS and power off computer.
Then, take apart computer and reconnect hard disk steadily. Supposing the Missing Operating System error appears due to unsteady connection, the hard disk would appear in BIOS again after reconnection, and then Windows might be bootable. But sometimes the target hard disk is still invisible even though we have done reconnection, and there are 2 possible reasons: the interface for the drive is forbidden; or the hard disk has been damaged seriously.
To deal with this kind of situations, please highlight the option for the hard drive and press on Enter. Then choose " Auto " when there is such an option. If the hard drive is also invisible in BIOS after we selected " Auto ", it may have serious problems, and you'd better send it to repair or for replacement. Nevertheless, even if the hard disk has been detected by BIOS, we may get 2 different results: Windows starts up successfully or Windows is still unbootable.
If you get the second result unfortunately, please follow Solution 2 to test hard disk to see whether it has failures. On some types of motherboards, hard drive diagnostic tools are added to help users test hard disk for errors, and you can enter BIOS to see whether there is such a tool on your motherboard. As to how to enter BIOS, we have said in solution 1. If you do not know how to use your diagnostic tool, please view your computer or motherboard manufacturer's website to find specific operations.
If any test fails, users can contact their hard disk or computer manufacturers for a replacement as long as these devices are under warranty.
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