Summary :

missing operating system

Missing operating system when booting computer? What acquired this error and how can we resolve this result? At present read this postal service and find the best solution works for operating system not constitute in Windows 10/8/seven.

Quick Navigation :

  • Brief Introduction to Missing Operating Organization Mistake
  • five Causes That Lead to Operating System Missing
  • 5 Solutions That May Help You Exit of Missing Operating Organization Error
  • User Comments

Brief Introduction to Missing Operating Arrangement Mistake

While you are trying to start a Windows operating system, you may receive the error message "Missing Operating System" on the black screen. That's a so annoying error since it prevents you from booting into Windows. Well then, what's the crusade for this error and how can we get missing operating organization back? These are what nosotros are going to talk in this postal service.

Tip: Depending on the BIOS used past arrangement, the error message could also be "Operating System non Constitute".

5 Causes That Lead to Operating Organisation Missing

In general, both hardware issues and software failures tin can make an operating system not found, and here we mainly list the post-obit 5:

  1. The basic input/output system (BIOS) does not detect the hard disk that installs Windows.
  2. The hard disk drive failed either physically or logically.
  3. Users make improper or incorrect BIOS settings.
  4. Windows Master Kick Record (MBR) located on the difficult bulldoze is damaged or corrupted.
  5. The partition which saves Windows kicking files is no longer active or users gear up wrong sectionalisation active.

If ane or more of these 5 problems are truthful, users will receive the disturbing error message Missing Operating System or Operating System not Found. Fortunately, for each cause we have the corresponding solution. Let'southward see details.

missing operating system
operating system not found

v Solutions That May Help You Become out of Missing Operating System Error

Since multiple issues can lead to the error, virtually users do not know how to starting time the repair. Actually, they had better kickoff with checking difficult drive for hardware failures and and then deal with software issues since the latter should exist washed on the base of correct hardware condition. And the following 5 solutions are introduced in this order.

Solution 1. Check If Hard Drive Is Detected by BIOS

If the system disk isn't recognized past BIOS, it cannot be used to read and write information. Every bit a event, all files including Windows Os saved on the disk volition be inaccessible. If you fabricated grit clean or your computer suffered heavy shock before the Operating Organization not Found error appears, it is necessary to check whether the hard disk drive is detected by BIOS. Detailed steps are equally follows:

Start computer and press a specified fundamental to enter BIOS. Usually it is F2, F10, Del…Yet, different computers or motherboards require unlike keys, and so y'all'd ameliorate search on the internet or you can consult your computer manufacturer to go the correct fundamental.

In BIOS please find these or like items: IDE Master Master, IDE Primary Slave, IDE Secondary Master, etc.

Now attention:If no disk is shown up or arrangement disk isn't hither (shown every bit "None" or "Not Detected"), we can say BIOS doesn't detect the drive. At this fourth dimension, different users should accept dissimilar measures.

If you are capable of taking out hard deejay and then connecting it correctly, please quit from BIOS and power off calculator. And so, take apart computer and reconnect hd steadily. Supposing the Missing Operating System error appears due to unsteady connection, the hard disk would appear in BIOS once again after reconnection, and then Windows might be bootable.

Tip: If y'all are unclear most internal structure of estimator, please do not operate at random, because even a slight error may cause more than serious damage. And yous'd better enquire professionals for help.

Merely sometimes the target hard deejay is still invisible even though we have washed reconnection, and in that location are ii possible reasons: the interface for the bulldoze is forbidden; or the difficult disk has been damaged seriously.

To bargain with this kind of situations, delight highlight the option for the difficult drive and press on Enter. And so cull "Auto" when there is such an option. If the difficult drive is also invisible in BIOS after we selected "Auto", it may accept serious problems, and you'd better send it to repair or for replacement.

Nevertheless, even if the hd has been detected by BIOS, nosotros may get 2 dissimilar results: Windows starts up successfully or Windows is still unbootable. If you get the second upshot unfortunately, delight follow Solution 2 to test hard disk to see whether it has failures.

Solution 2. Test Hard Disk to Run into Whether It Failed or Not

Tip: If you are agape of losing important files during difficult drive test, information technology is possible to transfer these files out in accelerate. MiniTool Partition Magician Bootable is such a bootable data recovery solution that can recover data without loading Windows. For more information, please encounter How to Recover Data when PC Wont Boot.

On some types of motherboards, hard drive diagnostic tools are added to help users examination difficult deejay for errors, and y'all tin 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 one.

Primary Hard disk Self Examination under Diagnostics is the very tool I can use to brand a test. If you do not know how to apply your diagnostic tool, please view your computer or motherboard manufacturer'south website to find specific operations.

If whatsoever examination fails, users can contact their hard disk or computer manufacturers for a replacement as long as these devices are under warranty. However, in gild to avoid data loss and privacy leakage, users demand to do the following ii operations before the replacement if their hard drives are however functional: transfer all important and individual information out to brand a backup; erase source data to avoid privacy leakage.

Y'all tin perform these operations on another reckoner provided that you have another normal estimator available and know how to connect the failed drive to the normal computer as a slave drive. And then you simply back up desired data and erase the source deejay.

Even so, if no normal computer is available, you'd better perform these operations: utilise a bootable partition manager to copy needed data, and so erase source data. MiniTool Partition Wizard Bootable CD (embedded in Partitioning Wizard paid editions) can aid do these operations.

Buy Now

Earlier you lot start:

  • Follow How to Build Kick CD/DVD Discs and Boot Flash Bulldoze with Bootable Media Builder to create a bootable MiniTool Partition Magician first.
  • Prepare computer to boot via the bootable media and go the master interface of MiniTool Partition Wizard.
backup before you wipe the hard drive

Steps to Re-create Disk or Sectionalisation:

  1. Right-click the target deejay (or partitioning) and choose "Copy" feature from the context menu.
  2. Then, follow the wizard to become through all preparatory jobs.
  3. At last, click "Apply" push button to make all changes applied.

Steps to Wipe Disk or Partitioning:

  1. Select the target disk (or division) and choose "Wipe Disk" (or Wipe Partition).
  2. Then, choose a wiping method and click "OK".
  3. At last, click "Utilize" button to make all changes practical.

Even so, if all tests pass, nosotros guess the Missing Operating System fault might be caused by software failures, and users tin try taking the third solution.

Solution 3. Set BIOS to Default State

Sometimes doing wrong or inappropriate BIOS settings may pb to operating system non plant. If no fault is establish during difficult deejay test, try setting BIOS to default state, which may solve your problem. Detailed steps are equally follows:

  1. Restart figurer and enter BIOS.
  2. Find and enable the default setup pick, which could be Load Optimal Defaults, Get Default Values, Load Optimized Defaults, Load Setup Defaults, and so on.
  3. Press on F10 to save changes and quite from BIOS.

Still, if method 3 doesn't solve your problem, your hard drive's MBR may have been damaged.

Solution 4. Rebuild Master Kick Record

Both mistaken operation and virus set on may cause MBR damaged. Once this special kicking lawmaking (located in the start sector of a hard disk) is damaged, Windows won't start. Well and so, how tin we fix or rebuild MBR without loading system? Users can turn to these 3 tools: Windows installation CD/DVD, Windows repair disk, and MiniTool Division Magician Bootable CD (a freeware for Windows non-server users).

Rebuild MBR with Windows Installation Deejay or Repair Disk

If you lot are using Windows installation deejay, start reckoner with information technology to go Linguistic communication select interface, and then brand preferences, and click "Next" to continue.

repair computer in windows installation disk

And so, choose "Repair your computer". After that, select a organization to repair and click "Next>" to become multiple recovery tools:

recovery tools in windows installation disk

Here, we tin can choose either "Startup Repair" or "Control Prompt" to practice the recovery. Withal, since the erstwhile volition automatically set all problems that are preventing Windows from starting, information technology requires much more time. So here we just choose Control Prompt to open a command prompt window.

In the window above nosotros can blazon "bootrec /fixmbr" to fix MBR only, but we can also type "bootrec /fixboot" and "bootrec /rebuildbcd" to do more repairs. At last, safely quit from Command Prompt by typing exit.

repair mbr in command prompt of windows installation disk

Since steps to fix MBR by using Windows repair disk are nearly the same as those by using installation deejay, here we don't introduce this plan.

After these operations, y'all can restart estimator to run into whether "Missing Operating System" has been solved. Still, Microsoft says the fixmbr control may damage your partition table if a virus presents or if a hardware problem exists. Once segmentation table is damaged, existing partitions might be inaccessible so that data cannot be used.

Well, is there a much safer fashion? Actually, MiniTool Division Wizard Bootable CD can help rebuild MBR without bringing any damage to data and partition since information technology operates the master boot tape only. For detailed steps, please run into Rebuild MBR.

See! I effectively get missing operating organization back.

Notwithstanding, if fixing MBR nonetheless doesn't work, users need to endeavour our last solution.

Solution 5. Set Right Division Active

If nosotros are running Windows under Legacy BIOS + MBR fashion, the sectionalization which saves kicking files should be set up active so that MBR tin pass boot right to kicking managing director which is in charge of finding Windows. If a incorrect partition is set agile, naturally operating organization cannot be plant. For more details of Active Division, delight see Accidentally Marked Bulldoze C Active.

Fortunately, users can start computer via bootable sectionalisation tool to meet whether the active partition is set correctly. If NOT, they tin can set up the wrong partitioning inactive and mark the correct partition agile. MiniTool Segmentation Wizard Bootable CD (built in the paid editions) can help do these operations. Detailed steps are as follows:

Purchase Now

  1. Firstly, boot reckoner with MiniTool Partition Sorcerer kick disc to get the main window.
  2. Then, bank check whether the correct partition is set agile. If at that place is no active division or a incorrect partition is set up as agile, please click on the correct partition and choose "Set Active".
  3. Finally, click "Apply" push to make all changes performed.
set partition active

For detailed steps, delight see Gear up Partitioning Active/Inactive. Once all changes are completed, try booting Windows from local hard drive.

Now, all solutions to Missing Operating System or Operating System not Found error have been shown, and you can try using these solutions when troubled past such a kind of question. If one or some of these resolutions are proved to be useful for you, please share this mail service to others who take similar troubles.

"These five solutions to Missing Operating Arrangement & Operating System Not Found prove to be useful, and I estimate they are also useful to your buddies who are suffering from this issue…" Click to tweet

However, if all these solutions do not work to your state of affairs, the problem could be quite serious, and yous may need to reinstall Windows or contact your computer manufacturer or hd manufacturer for further assistance.

Tip: If you plan to reinstall Windows but are fear of losing desktop files as well as data saved in User documents, try using Power Information Recovery Bootable Edition mentioned in solution ii to transfer needed information out before reinstallation.