The following solutions to resolve errors indicated by the "Missing Operating System" or "Operating System Not Found" appears before Windows starts.
Missing Operating System
This error message may appear for one or more of the following reasons:
Laptop BIOS doesn't detect hard drive.
The hard drive is physically damaged.
The master boot is damaged Windows entry(MBR) on the hard drive.
A section or fragment of a hard disk containing the main boot entry Windows (MBR), no longer active.
Use one of the following methods to resolve this error:
Step 1: Testing the Hard Drive
Follow these steps to hard checks laptop disk using the utility itself hard testing disk.
If all tests were successful, press the power button to restart your computer. If the error persists, go to Step 2.
Step 2: Troubleshoot Windows Master Boot Record
The Windows Master Boot Record (MBR) is a partition on your hard drive designed to run the Windows operating system. If the Master Boot Record (MBR) is damaged, your computer will not be able to start. To troubleshoot Windows Master Boot Record, you can use installation disk with the Windows operating system, supplied with the laptop. To troubleshoot Master Boot Record (MBR) problems, follow these steps:
Insert the Windows operating system installation disc into your CD or DVD drive.
Press and hold the Power button for 5 seconds to turn off the computer. Then press the Power button to turn on your PC.
Press Enter when prompted by the system to boot from CD.
From the Windows Setup Menu, press the R key to launch the Recovery Console.
At the C:\> command prompt, type FIXMBR and press Enter to continue.
Press y and then Enter when asked if you want to create a new boot record (MBR).
After successfully writing the boot record (MBR), restart your computer by pressing the Power button.
NOTE:More detailed information on working with the console Windows recovery (Windows Recovery Console) see Microsoft document: More information about the Windows Recovery Console (in English).
Step 3: Reinstall Windows Operating System
Follow the instructions to reinstall the Windows operating system on your laptop.
Step 4: Contact Service technical support HP
If steps 1, 2, or 3 do not resolve the issue, contact support for assistance.
It happens that when you turn on personal computer the message Missing appears on the screen instead of the usual desktop screensaver on a blue or black background operating system Windows 7 and in the future the machine becomes inoperable. Let's consider what to do with an error missing operating system in windows 7?
What's going on in the computer?
The reason for the appearance of the message in question is Windows system 7, as in its analogues, follows directly from the translation of the message. This system information means that the entry used to initialize is lost. operating system.
Missing operating system error on boot
This happens in cases of physical damage to those permanent memory devices on which the operating system is recorded, as well as due to failures in the initial settings.
Changing BIOS Settings
Change BIOS settings is revealed extremely simply, because in this situation, due to a failure, the system starts from the wrong hard drive. You just need to check it and restore it if necessary.
To do this, you need to boot from your hard drive.
Hard drive damage
A hard drive failure makes the boot procedure physically impossible. Damage is detected by diagnostic testing. The MHDD and Victoriya programs are suitable for this, they allow you to view the SMART of a hard drive, as well as check its surface for bad sectors.
In severe cases, the drive will need to be replaced.
Boot record violation
If a message appears missing operating system, what to do, if the reason for this lies in the boot record? This malfunction may occur as a result of an abnormal disconnection of the computer from the network or voltage surges in it.
Trying a standard recovery in the form of a rollback to a checkpoint will not help in such a situation.
In this situation, the computer starts or , after which you use the recovery console to go to the command line.
Check disk commands
Then a couple of boot recovery commands are entered:
Boot Repair Commands
If these procedures do not lead to the desired result, it is advisable to re-create the boot record.
To do this, boot from external media and, from the moment you enter the command line, in addition to the boot recovery commands, you also enter the command Rebuild Bsd.
Checking your computer configuration
The reason for the “failure” of a hard drive with an operating system can be a banal loss of cable contact, which can happen when installing a new internal device when there are a large number of existing ones. To eliminate this problem, simply connect the cable plug tightly to the disk connector again.
You turn on the computer and cannot get into the system. Many people have probably encountered this problem. In this material we will look at what needs to be done in such situations.
First of all, we remember what we did before the last time we turned off the computer, what parameters we changed, what we connected, what programs we installed. Now let's determine at what stage of the download we have a problem.
1) Before loading the operating system. That is, it does not reach the screen with the windows logo, we see only the post (English Power-On Self-Test) bios menu (English basic input/output system), a black screen with white letters.
As a rule, a line appears at the bottom in which the current problem is written, for example, the bios settings have changed, and you are offered to either press F1 in order to boot further, or go into bios (the del key most often) and change the settings. Your battery may have run out motherboard, and it needs to be changed. Otherwise, the computer will reset its settings after turning off. The standard battery is CR2032.
Another variant of the inscription – bad smart
S.M.A.R.T.(from English self-monitoring, analysis and reporting technology - technology of self-monitoring, analysis and reporting) - technology for assessing the condition of a hard drive using built-in self-diagnosis equipment, as well as a mechanism for predicting the time of its failure.
This means that the disk self-diagnosis has detected one of the parameters as critical, in this situation we need to quickly save all important data and replace hard drive. View current S.M.A.R.T. information you can use this program
How to diagnose a disk using the MHDD program in the article.
2) Let’s assume that our POST screen goes through normally, but the operating system still doesn’t load, and errors like these appear:
bootmgr is missing, Missing Operating System or Operating System Not Found
IMPORTANT: If you see this message when loading, check whether you have a flash drive plugged in or a disc inserted into the CD-rom. By default windows may try to boot from them! Remove all removable storage media and try to boot again.
A little educational information from Wikipedia:
Master boot record (MBR) is the code and data necessary for the subsequent boot of the operating system and located in the first physical sectors (usually the very first) on a hard drive or other storage device. The MBR contains a small fragment of executable code, a partition table, and a special signature. The MBR function is to “move” to the partition of the hard drive from which “further code” should be executed (usually loading the OS). At the “MBR stage,” a disk partition is selected; OS code is loaded at later stages of the algorithm. During the startup process of the computer, after the completion of the initial test (Power-on self-test - POST), the Basic Input/Output System (BIOS) loads the "MBR code" into RAM(in IBM PC usually from address 0000:7c00) and transfers control to the one in MBR boot code.
So, bootmgr is the windows boot manager, the next stage after executing the MBR. At windows installation creates a small partition at the beginning of the disk with a size of 100 megabytes, where it is stored. An option is possible without this partition, at the root of the system disk.
bootmgr is missing means that this file not detected, or deleted (due to some misunderstanding, or a 100 megabyte partition was deleted by the user’s playful hands)
Let's correct the situation. We take the installation windows disk, boot from it (set the boot in the BIOS) or press F12 when loading.
run it, we see the following window
We select “startup recovery”, wait until the program runs, and try to reboot, not forgetting to remove the disk.
If it works, good, if not, then try the next option. Instead of restoring startup, select “command line”
There we enter the following commands:
Bootrec.exe /FixMbr
Launched with the /FixMbr switch, the utility writes the Master Boot Record (MBR) to the system partition
Bootrec.exe /FixBoot
Launched with the /FixBoot switch, the utility writes a new one to the system partition boot sector. Will help in the following situations:
- The boot sector has been replaced with a non-standard one.
- The boot sector is damaged.
- A previous version of the Windows operating system was installed.
Missing Operating System or Operating System Not Found
1. Laptop BIOS does not detect the hard drive.
2. The hard drive is physically damaged.
3.The Windows Master Boot Record (MBR) on your hard drive is damaged.
4. The partition or portion of the hard drive that contains the Windows Master Boot Record (MBR) is no longer active.
Take actions as for missing bootmgr.
Blue screen when loading windows, aka BSOD
Blue Screen of Death, Blue Screen of Doom, BSoD - the name of a message about a critical system error in operating systems Microsoft Windows. There are three types of BSOD messages: for the Microsoft Windows 95/98/Me family, for the Microsoft Windows NT/2000/XP/2003/Vista/7/8 family, and for the Microsoft Windows CE family.
Reasons – incorrect installed drivers, malfunctions of any computer components, such as memory, HDD, video card.
If blue screen began to appear after updating drivers, or installing some programs and an emulator, we need to do a system rollback. We will need the windows installation disk again.
Load System Restore again (see above) and, in fact, select the “System Restore” item. There we will be asked to restore the state of the OS to some point where the checkpoint was saved, but personal files and documents will not be affected.
We select the optimal restore point, preferably at the moment when the system booted normally, and start the process. After the reboot, we will get the system at the point in time that we selected.
If we haven’t installed anything, and the system still crashes into a blue screen, one of the most common failures is RAM.
The memory diagnostic tool is also built into system recovery, you need to run the test, and if errors are detected, the program will write to us about it.
If errors are found - and we have several memory sticks installed, then we remove the sticks one by one and repeat the test. There we will find the faulty one.
And finally, I want to recommend a very good and effective tool - boot disk windows, which contains a lot of useful utilities for computer repair. It's called Hiren's boot cd. We will review it in the following articles.
If you have questions, ask them at , or below in the comments.
One of the errors that could theoretically occur when you try to turn on your computer is “Missing operating system.” Its peculiarity is precisely that if there is such a malfunction, you will not even be able to start the system. Let's find out what to do if you encounter the above problem when activating your PC on Windows 7.
The cause of the specified error is the fact that Computer BIOS Windows can't find it. The message “Missing operating system” is translated into Russian: “There is no operating system.” This problem can be either hardware (hardware failure) or software in nature. Main factors of occurrence:
- OS damage;
- Hard drive failure;
- Lack of connection between the hard drive and other components of the system unit;
- Incorrect BIOS setting;
- Boot record corruption;
- No operating system on the hard drive.
Naturally, each of the above reasons has its own group of elimination methods. Next we will talk about them in detail.
Method 1: Troubleshooting Hardware Problems
As mentioned above, hardware faults can be caused by a lack of connection between hard drive and other components of the computer or a breakdown of the hard drive itself.
First of all, to eliminate the possibility of a hardware factor, check that the hard drive cable is correctly connected to both connectors (on the hard drive and on the motherboard). Also check the power cable. If the connection is not tight enough, then this deficiency must be eliminated. If you are sure that the connections are tight, try changing the cable and cable. Perhaps the damage is directly in them. For example, you can temporarily transfer the power cable from the drive to the hard drive to check its functionality.
But there can also be damage to the hard drive itself. In this case, it needs to be replaced or repaired. Repairing a hard drive if you do not have the appropriate technical knowledge is best left to a professional.
Method 2: Check the disk for errors
The hard drive may have not only physical damage, but also logical errors, which causes the “Missing operating system” problem. In this case, the problem can be resolved using software methods. But given that the system does not start, you will need to prepare first, armed with a LiveCD (LiveUSB) or installation flash drive or disk.
Method 3: Recover Boot Record
The “Missing operating system” error may also be caused by a damaged or missing boot loader (MBR). In this case, you need to restore the boot record. This operation, like the previous one, is performed by entering the command in « Command line» .
Method 4: Fixing corrupted system files
The cause of the error we describe may be critical damage system files. In this case, it is necessary to perform a special check and, if violations are detected, carry out a recovery procedure. All of these actions are also performed via "Command line", which should be launched in the recovery environment or via Live CD/USB.
Method 5: BIOS Settings
The error we describe in this lesson. May also arise due to incorrect setting BIOS (Setup). In this case, it is necessary to make appropriate changes to the parameters of this system software.
Method 6: System recovery and reinstallation
If none of the above methods for fixing the problem helped, you should think about the fact that perhaps the operating system really is not on the hard drive or the media from which you are trying to start the computer. This can happen for a variety of reasons: perhaps the OS was never on it, or maybe it was deleted, for example, due to formatting of the device.
In this case, if you have backup OS, you can restore it. If you did not take care of creating such a copy in advance, you will have to install the system from scratch.
There are several reasons why the message “BOOTMGR is missing” is displayed when starting a computer on Windows 7. Depending on the factor that causes this error, there are ways to solve the problem. The most radical options are to completely reinstall the OS and replace the hard drive.
Often computer users or OS startups are faced with the message “Missing Operating System”. As a result of this error, the user cannot proceed to install or work with the operating system. In this article we will look at the main reasons that can affect the occurrence of this problem, as well as what methods exist to eliminate it.
This message appears in two cases: after you wanted to start Windows as usual or after you installed a flash drive or disk with the operating system in the boot loader, but instead of displaying the installer window, a message is displayed on the screen "Missing Operating System" . In Russian, the system could not detect the operating system.
Reasons for the error:
1. The boot device is not created correctly or is not functional at all;
2. There is damage to the hard drive;
3. There is damage to the hard drive on which Windows is located;
4. Damage to the MBR, which is located on the hard drive;
5. The cables inside the system unit may have come loose from the connectors.
Ways to resolve the error if you are running Windows
1. Turn off your computer and unplug it for a while, letting it sit for a few minutes. Next open system unit and check that all cables and cables are connected in place. It is quite possible that some cable may have moved away from its nest, and therefore you cannot use the operating system.
2. If you have various removable media – disks or flash drives – connected to your computer, remove them. It may well turn out that these devices are installed as boot device by default, which is why you cannot proceed to boot Windows.
3. Try using bootable flash drive or a Windows disk to implement .
4. If the problem is still not resolved, you should try reinstalling Windows.
5. And finally, if the first four methods did not bring results, you should be suspicious. If this is indeed the case, then you need to think about replacing it.
Ways to resolve the error if you are reinstalling Windows
1. First of all, make sure that you have a working removable media(disc or flash drive), try it, you can use an alternative program, of which there are a lot today.
2. Check the inserted flash drives and disks into your computer. If they are present, they must be removed.
3. Turn off the computer for a few minutes, completely unplugging it from the network, and then open the system unit and check the connections of the cables, especially paying attention to the hard drive and motherboard.
4. Run the built-in hard drive test function in the BIOS. To do this, enter the BIOS and go to the menu "Tools" - " Hard Drive Self Test" (name may vary). If at the end of the check any test was not performed, this may indicate hard drive malfunction disk, and therefore you will have to replace it.
If you still cannot fix the problem yourself, we recommend that you contact service center, where qualified technicians will be able to diagnose the device and identify the cause of the problem.
