Here I fixed Missing Operating System or Operating System Not Found error on Windows 10, Windows 8.1, Windows 7, Windows 8 and Windows XP. About Boot Configuration Data. BCD, a database, is able to be used to load and run OS. In different boot mode, BCD is located differently: for UEFI boot, the BCD file is located at /EFI/Microsoft/Boot/BCD on the EFI system partition; for BIOS boot, it is at /boot/BCD on the active partition.

Contents.About “ Operating System not found“The following information on this error has been compiled by NeoSmart Technologies, based on the information gathered and reported by our global network of engineers, developers, and technicians or partner organizations. Description and SymptomsThe error messages, alerts, warnings, and symptoms below are tied to this error. Symptom 1: “Operating System not found” error screen on startupWhen a PC is booting, the BIOS tries to find a operating system on a hard drive to boot from. Jewels of the oracle download free. However, if it is unable to find one, then an “Operating system not found” error is displayed. It may be caused by an error in BIOS configuration, a faulty hard drive, or a damaged Master Boot Record.Operating system not foundAnother possible error message is “ Missing operating system“. This error is also very common on Sony Vaio Laptops. Causes of this ErrorThis error has been known to occur as a result of one of the following causes: Cause 1: Bad BIOS configurationSince this error occurs when BIOS is unable to find the operating system, checking the BIOS settings first is often a good solution.

The BIOS configuration can become incorrect because of power outages, hardware errors or errors made when configuring the BIOS manually. Cause 2: BCD is damagedSimilar to the errors outlined in the and articles, this error can also appear when BCD becomes damaged. Cause 3: Faulty data cablesIf the BIOS is unable to detect the hard drive, the faulty data cables are often to blame. Try to unplug, and then plug them back, or even replace them altogether and see whether the problem persists. Fixing “Operating system not found” on WindowsWindows Setup CD/DVD Required!Some of the solutions below require the use of the Microsoft Windows setup CD or DVD.

If your PC did not come with a Windows installation disc or if you no longer have your Windows setup media, you can use instead. EasyRE will automatically find and fix many problems, and can also be used to solve this problem with the directions below. Fix #1: Rebuild BCD via Easy Recovery Essentials. Easy Recovery Essentials can fix many errors such as this automatically using its built-in Automated Repair option. EasyRE is currently available for Windows XP, Vista, 7 and 8 and can be downloaded and created on any PC.

Make sure to note your Windows version (XP, Vista, 7 or 8) before you download EasyRE. This guide can help you you have installed. Burn the image. Follow these instructions on very carefully, as making a bootable CD can be tricky! Alternatively, these instructions explain. Boot up your PC or USB you created.

Once EasyRE is running, choose the “Automated Repair” option and click Continue. Windows, booting up successfully.You can download Easy Recovery Essentials. Fix #2: Change or reset the BIOS configurationSince this error often occurs when BIOS is unable to find the hard drive, checking BIOS settings might be a good solution.To check the BIOS settings, follow these steps:. Restart the computer. Press the necessary key to open BIOS menu. This key depends on the computer manufacturer and computer model. This is usually listed on the first screen that appears on the monitor.

It can be any of the following: Esc, Del, F2, F8, F10 or F12. If the screen shows multiple keys, find the key to open “BIOS”, “setup” or “BIOS menu”. Check the BIOS’ main screen to see whether it detects the hard drive, and the boot order to see if it is set correctly.Here are the screenshot examples of BIOS’ main screen, with a hard drive and a CD-ROM that were properly detected, and a boot order screen that has a hard drive in the first position. BIOS boot order screenIf the hard drive is not detected properly, consider replacing the data cables, or resetting the BIOS settings to default values. Here are the steps to reset BIOS settings:.

Enter the BIOS screen by following the steps outlined above. Find the “Reset to default” or “Setup default” option – it could be either a hotkey, or an option in the menu. Choose the reset option, and answer “Yes” when prompted for a confirmation. Then, select the “Exit - Exit saving changes” option.

BIOS reset defaults screen Fix #3: Run Automatic RepairThe Windows Automatic Repair may recover certain boot process related errors in some cases. Here are the steps to access the Automatic Repair from an install disc:. Boot from Windows install disc. Click Next in the setup page after selecting proper language, time and keyboard input. Click Repair your computer and select Troubleshoot. Click on Advanced options.

Select Automatic Repair and select your operating system.Here is an example of what the PC’s startup repair should look like once the BOOTMGR file is properly restored. Bootrec utility results screen Fix #5: Reset BIOS settings on Sony VAIO LaptopThe eSupport section of suggests the following solutions if your VAIO laptop is showing this error:.

Remove all removable media, e.g.