I have tried to repair the start up using both a repair disk and a Win7 disc, I can boot it into the repair mode, but when the box. When I have used the command prompt in repair mode, some of the files on my computer are listed, so there are still files there,.
Its also not showing the other partition on my HDD. This thread is locked. You can follow the question or vote as helpful, but you cannot reply to this thread. I have the same question Report abuse. Details required :. Cancel Submit. If there is no operating system on your hard disk, the boot process will stop and display operating system not found.
Of course, sometimes this message pops up due to a variety of reasons, such as:. The good news is that the corresponding solution for each issue is easy to perform, even for non-tech savvy. Step 1. There is an onscreen message prompts the correct key. Step 2. Note: BIOS menu is the starting point to fix the problem that operating system not found. If the settings in your BIOS menu are fine and you encounter the error message, skip to part 5 to fix it.
On the other hand, if hard drive is missing on BIOS menu, you should go try the solution in part 4 after testing your hard drive. If not sure, you can test and diagnose if the hard disk is fine. In most computers, the diagnosis tool has pre-installed in the BIOS system. The diagnostic tool may be different on computers from various brands; you can get the information on manufacturer's website.
Step 3. Once the testing process is done, you can decide to replace the damaged disk or keep on troubleshooting according to the result.
Note: Generally speaking, there are damaged sectors on hard drives due to incorrect operations, virus or other factors. But it does not mean that the entire hard disk is dead. You can mark the damage sectors with third party programs and using your hard disk without problems. If you prepare to replace the damaged hard disk, you'd better back up data first. If your hard disk is fine and the operating system not found due to BIOS not recognizing your hard drive, you can try resetting the entire BIOS menu to default values, following the steps below.
Press "F9" to perform the command "Setup Defaults". When prompted and restart your device, press the "Load Optimal Defaults" option to confirm the operation. If any of them is damaged or corrupted, you will see operating system not found on your screen. Fortunately, it is simple to fix this problem by rebuilding Master Boot Record.
Insert Windows Installation disk or Windows repair disk into your computer and reboot it. When Windows Setup screen appears, fill out the preference settings and click "Next". Then select "Repair your computer" to move on. Step 4. Input the commands below and hit the Enter key after each of them: bootrec. Step 5. Finally, reboot your PC and check if your operating system works now. Note: On Windows 7 and earlier, the system recovery options window will pop up after click "Repair your computer", and then you can select Command Prompt to open it directly.
As said before, it is possible that the partition that contains Windows boot files is no longer active, and trigger the error message operating system not found. To set the correct partition active, you also need to open the Command Prompt using the Windows installation or repair disk. You should contact your hard disk or computer manufacturer for a replacement as long as these devices are under warranty.
You can try to set BIOS to default settings to solve the problem. Both wrong operation and virus infection can damage MBR, which locates in the first sector - usually sector 0 of the hard disk. Thus, Windows will not boot. If you prefer an easier and safer way to rebuild or repair the MBR disk, you may apply third-party partition magic software - EaseUS Partition Master to perform an automatic repair.
On top of that, some brands provide customers with inbuilt tools to deal with MBR issues. If the system partition or boot partition is not set to active, you may encounter the operating system not found issue. Step 1. Run EaseUS partition manager software. On the disk map, right-click the traget partition and choose "Advanced". 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.
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