The 'missing operating system' or 'operating system not found' error message usually appears on a black window when you start your Windows computers. This error is very common for Dell, Acer, Lenovo, HP and Sony desktops and laptops. When your Windows 10/8/7/XP/Vista operating system not found on its boot drive, it's impossible to start the computer until the operating system is restored. You can read on to get error details or directly jump to comprehensive solutions.
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To find out which version of Windows your device is running, press the Windows logo key + R, type winver in the Open box, and then select OK. Here’s how to learn more: Select the Start button Settings System About. Open About settings; Under Device specifications System type, see if you're running a 32-bit or 64-bit version of Windows.; Under Windows specifications, check which. I currently have two partitions on my HDD and I was planning on repartitioning my secondary partition to make room for a third to use for Ubuntu. However when I attempt to install (with DVD & USB) I get the following message: 'This computer currently has no detected operating systems'.
Workable Solutions | Step-by-step Troubleshooting |
---|---|
Fix 1. Check BIOS | Press and hold 'F12/F10' to enter BIOS..Full steps |
Fix 2. Reboot from a bootable disk | Press and hold 'F10' and press 'Power'..Full steps |
Fix 3. Set BIOS to default settings | Find BIOS and enable the default setup option..Full steps |
Fix 4. Rebuild MBR using cmd | Insert the Windows installation CD/DVD..Full steps |
Fix 5. Rebuild MBR using software | Boot PC from EaseUS Partition Master ..Full steps |
Fix 6. Rebuild MBR for HP | Boor from Windows Operating System Disc..Full steps |
Fix 7. Set correct partition active | Boot from EaseUS WinPE bootable disk..Full steps |
Causes of 'Missing Operating System' or 'Operating System Not Found'
When you pressed the power button to boot a PC, in the first place, BIOS tries to find an operating system on a hard drive to boot from, later wakes your PC up. However, if the BIOS fails to detect the operating system where it should be, you will receive one of the following error messages, which tells the same problem on different operating system versions.
Error message 1.
Missing Operating System
Error message 2.
Operating system not found
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For professionals, they'll soon notice that something goes wrong with the BIOS configuration, hard drive health, or the Master Boot Record. To be specific, the causes of the error are as follows.
- The basic input/output system (BIOS) does not detect the hard disk
- The hard disk drive is damaged
- Improper/incorrect BIOS settings
- Windows Master Boot Record (MBR) is corrupt/damaged
- An incompatible partition is set as active
Solutions to Operating System Not Found or Missing in Windows 10/8/7
After 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.
Solution 1. Check if the hard drive is detected by BIOS
Step 1: Press and hold 'F12/F10' while pressing the 'Power' button to turn on the PC.
Step 2: Release F12/F10 when the BIOS Setup Utility is displayed.
Step 3: Try to find IDE Primary Master, IDE Primary Slave, IDE Secondary Master and check whether they can be detected or not.
If no disk is shown or displayed as None/Not Detected, it means that the BIOS doesn't detect the drive and you may select None to Auto. This may solve OS not found error.
If the system disk information is displayed, it means that BIOS can detect the hard drive and you need exit BIOS.
Solution 2. Test hard drive problems
Step 1: Press and hold 'F10' and press the 'Power' button to turn on the PC > Release F10 after the PC screen display you with test
Step 2: Use the right arrow to select the 'Tools' menu in the BIOS Setup Utility
Step 3: Then select 'Hard Drive Self Test' > Press 'Enter' to start the test
After the test, you'll get two results:
#1. All tests passed
the hard drive is not damaged. You may jump to Solution 3 to reset BIOS to the default state.
#2. The test failed
You should contact your hard disk or computer manufacturer for a replacement as long as these devices are under warranty.
Solution 3. Set BIOS to default settings
Improper settings or incorrect BIOS setting may also cause the issue 'operating system not found' in your PC. You can try to set BIOS to default settings to solve the problem.
Step 1: Restart PC and enter BIOS.
Step 2: Find BIOS and enable the default setup option, including Load Optimal Defaults, Get Default Values, Load Optimized Defaults, Load Setup Defaults, and so on.
Step 3: Press 'F10' to save changes and quit from BIOS.
If this method doesn't work, the MBR disk could be damaged and you may jump to Solution 4 to find the MBR disk repair method.
Solution 4. Repair MBR with the installation CD/DVD
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. You can try to repair MBR using the Windows installation disk in Command Prompt.
Insert Windows Operating System Disc to the optical (CD/DVD) drive
Step 1: Press the 'Power' button to turn on the PC > Hit 'Enter' when Boot from CD prompt
Step 2: Press 'R' key in Windows Setup Menu to start the Recovery Console
Step 3: Type: FIXMBR at the C:> prompt and hit 'Enter'
Step 4: Press 'Y' key > hit 'Enter' when asked if you want to write a new MBR;
Step 5: Restart PC by pressing the 'Power' button when the MBR completes the writing process.
Solution 5. Rebuild MBR without Windows Installation CD/DVD
If you prefer an easier way to rebuild or repair the MBR disk, you may apply third-party partition magic software - EaseUS Partition Master to perform an automatic repair.
Boot your Windows from the WinPE environment you created and start to repair MBR with a few clicks.
Step 1.Create a WinPE bootable disk.
- Download and launch EaseUS Partition Master on a new PC which runs the same system as yours.
- Click 'WinPE Creator' on the toolbar. And select to create the bootable disk on a USB drive. If your computer has a CD/DVD drive, you can also create the bootable disk to CD/DVD.
- Click 'Proceed' to finish the process.
Step 2.Rebuild MBR.
- Connect the bootable USB or CD/DVD to your PC.
- Press 'Del' when you are restarting the computer. Boot your computer from 'Removable Devices' or 'CD-ROM Drive'. And then EaseUS Partition Master will run automatically.
- Right-click the disk whose MBR is damaged. Choose 'Rebuild MBR' to continue.
- Select the type of MBR with the current operating system. Then, click 'OK'.
- Click the 'Execute 1 Operation' button at the top-left corner and click 'Apply' to build the MBR. After that, your computer can boot normally again.
Solution 6. Repair MBR for HP
Solution 4~5 to corrupted MBR repair is applicable to various computer/laptop brands. On top of that, some brands provide customers with inbuilt tools to deal with MBR issues. For example, the Windows Operating System Disc (OSD) provided with your HP notebook PC can be used to repair the Master Boot Record.
Follow all steps at https://support.hp.com/us-en/document/c00476274
Solution 7. Set the correct partition active
When Windows is running under Legacy BIOS + MBR mode, the boot partition/system partition should be set as active so that MBR can pass boot right to boot manager and find Windows. If the system partition or boot partition is not set to active, you may encounter the operating system not found issue.
In the same partition tool, create the EaseUS Partition Master bootable USB first, and follow the steps to set the boot partition active:
Step 1. Download and launch EaseUS partition manager software.
Step 2. On the disk map, right-click the desired partition and choose 'Set Active'. The software will automatically execute the operation and create an active partition for you.
Do You Need Specialized Services for System Boot Issues?
EaseUS also provides 1-on-1 remote assistance to fix the boot issue. If the solution above does not work for you, please contact our professionals via Email or LiveChat in this page. To ensure our professional assistance work, you are suggested to connect the unbootable system drive to a healthy computer when getting connected with us.
Conclusion
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.
Sep 09, 2020 • Filed to: Windows Computer Solutions • Proven solutions
1Help! Missing Operating System in Windows!
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It really can't be more annoying than this: when sitting in front of the computer and start it, it gives you back a message saying 'Missing operating system' or 'Operating system not found' on boot. The reasons for these errors are hard drive is corrupted, Boot record is corrupted, BIOs did not detect hard disk, missing or corrupted command.con, virus infection, etc.
Fix it, and you will find your operating system will become normal.
22 easy solutions to get back your missing operating system
You can fix this operating system missing problem easily and effortlessly by yourself with Windows OS DVD (Windows 7, Vista, and XP). If you don't have a Windows OS DVD, I still have another solution for you.
Solution 1 Fix it with Windows OS DVD
1. Insert Windows OS DVD on your computer.
2. Click the key when you are asked to (to boot from DVD).
3. Then choose 'Repair your computer', not 'Install now', remember this.
4. Select the operating system after the installer searches for Windows installation, and click 'Next'.
5. Then click 'Startup Repair'. It will automatically fix problems that are preventing Windows from starting.
2. Click the key when you are asked to (to boot from DVD).
3. Then choose 'Repair your computer', not 'Install now', remember this.
4. Select the operating system after the installer searches for Windows installation, and click 'Next'.
5. Then click 'Startup Repair'. It will automatically fix problems that are preventing Windows from starting.
Solution2. Fix it with a bootable disk/USB
![Currently Currently](https://venturebeat.com/wp-content/uploads/2016/09/Screen-Shot-2016-09-07-at-1.09.41-PM.png?w=800)
If you don't have a Windows OS DVD and have no plan to spend hundreds of dollars on it, you can take this way. Getting a bootable disk or USB can solve your problem too. Wondershare Live boot CD/USB can be a good option for you to repair this operating system missing issue safely and completely. And it's more competitively priced, compared to the Windows DVD.
1. Create a bootable CD or USB drive with Wondershare LiveBoot 2012. Insert a blank CD or USB drive into the computer and run the Wondershare LiveBoot. Choose the guide of creating a bootable CD or USB drive according to your requirement. You only need to perform a click on the burning button in the center.
2. Insert LiveBoot bootable CD or USB into your computer, then restart the computer and press F12 to get into the Boot Menu. Choose the USB CD-ROM Drive and proceed. Then choose 'Boot from LiveBoot'.
3. After getting into the system, LiveBoot will be launched automatically. Choose 'Windows Recovery' on the top tab and hit 'Boot Crash Solution' on the right menu. In the part of 'Type A error messages', you will see the 'missing operating system' in No. 5.
4. The main reason why the operating system is missing is because of the damage of MBR, so take method 1 as its instructions to repair it.
If this method doesn't work, running a disk check to fix bad sectors which will affect your system files loading, or running bootsect command at Command Prompt to repair boot crash. If all these are not helpful, your operating system must have been damaged deadly, and you have to take the last one to reinstall your Windows and Office. Doesn't matter, this LiveBoot can help you reclaim your Office key and Windows CD key with one click in the part of 'Password & Key Finder', no extra money cost.
3 Recover data from 'System Operation is Missing' computer
If you are afraid of losing important files on your 'System Operation is Missing' computer, Recoverit computer data recovery can help you recover data from computer hard drive with ease.
Your Safe & Reliable Computer Data Recovery Software
- Recover lost or deleted files, photos, audio, music, emails from any storage device effectively, safely and completely.
- Supports data recovery from recycle bin, hard drive, memory card, flash drive, digital camera, and camcorders.
- Supports to recover data for sudden deletion, formatting, hard drive corruption, virus attack, system crash under different situations.
When your computer system has been missing, you should create a bootable media to help you enter the computer and retrieve your data back. Download and install Recoverit data recovery on a workable computer, prepare a USB drive or CD/DVD, and connect to the computer. Follow the next steps to creating a bootable media and get your data back.
Step 1: Launch Recoverit and select a data recovery mode. Please select the 'System Crash Data Recovery' mode to start.
Step 2: Click the 'Start' button to start creating bootable media.
Step 3: Select a mode to create bootable media. You can select a USB drive or CD/DVD, click the 'Start' button to process.
Step 4: You will be asked to format the USB drive before creating a USB media drive. Make sure you have backup all important data, click 'Format Now' to move on.
Step 5: It will take for a while to creating a bootable drive, please do not eject the USB flash drive.
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Step 6: After USB bootable media or CD/DVD bootable media created, you will get the guide to recover your data back.
- Adjust the BIOS to boot from USB/CD/DVD drive: restart your crashed computer and press the BIOS entry key when the first screen displayed. You can check out this page to learn how to set your computer to boot from a USB drive or CD/DVD drive.
- Connect the USB flash drive or insert CD/DVD drive to your computer.
- Restart your computer and start to recover data from the crashed system.
Fallout 76 t60 power armor mods. Step 7: You can follow the steps to recover data from the missing system. Preview the recoverable files and click 'Recover' button to save data.
Technically, except for those damaged or overwritten files, all lost/deleted files on your computer/flash drive or memory card could be re-detected and recovered by Recoverit hard drive recovery software.
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- Windows PE
- System problems
- PC Errors