Missing operating system: what to do with the error?
One of the most unpleasant and shockingusers messages at the start of the operating system is the appearance on the black screen of the line Missing operating system. What is to be done with "nbv" is not known to everyone, after all, it would seem that yesterday the computer or laptop worked quite normal, and nothing like that was noticed, but do not despair. Of course, the problem can be quite serious, especially with regard to physical breakdown hard disk, however in many cases, if the failure is not connected with the hard drive, it can be eliminated by several simple methods.
Download: Missing operation system. What does this error mean?
To begin with, a few words about what in generalrepresents this failure. As you know, on the hard disk of the computer there is, firstly, a special system partition in which the operating system is installed, and secondly, the boot partitions and records that are responsible for starting the OS.
So, what to do with the Missing operating system? Let's just translate this line. Based on a literal translation, this means a lost operating system. In other words, the computer accesses the boot records, directly to the boot loader and the system partition, and does not find the installed OS. Why?
Where did the system go? Missing operating system: causes of the failure
Indeed, where could the operating room go?system, if the user did not reinstall it, did not delete the system files and did not perform any actions at all, which, in his opinion, could affect the operability of the OS? Unfortunately, in most cases this opinion is erroneous. The fact is that the system itself is not immune from failures that do not depend on the user.
But, suppose the user saw on the screencomputer when starting the line Missing operating system. What to do with the error - it will be clear after finding out the reasons for its appearance. And among them, the following are the main ones:
- Incorrect boot priority settings in BIOS;
- incorrect parameters of the initialization and operation mode of the HDD;
- errors on the hard disk;
- bootloader and boot sectors corruption;
- wear of the hard drive;
- exposure to viruses.
Troubleshoot problems with BIOS settings
One of the most common problems isan incorrectly set boot priority, and very many users forget about it. Perhaps, last time the user just played the game using removable media (for example, DVD), maybe the BIOS settings "flew" by themselves, who knows ...
But back to the error of the Missing operating system. What to do in the simplest case? It is necessary to use the key or key combinations at startup and enter the primary input / output system, called the BIOS.
Here you need to find the boot partition (usually itcalled Boot, Boot Sequence, Boot Priority, or something like that) and look at the order of the devices from which the operating system starts. Suppose that the first DVD-ROM (optical drive) is installed in the list, the second one is a removable USB device, and only the hard disk HDD (Hard Drive) is in the queue.
Suppose, at the moment in the optical drivethere is no disk (or a system disk is inserted, for example, with a game) or a USB flash drive is inserted into the USB port, again, not with a bootable distribution, but with regular files. So it turns out that there is no boot records on these media, neither the boot loader nor the operating system, which leads to the appearance of the Missing operating system line. What to do in this situation? There are two options: either to remove all removable media and restart, or install as the first HDD device (in the BIOS on the 1-st Boot Device line, the PgUp / PgDown keys are usually used, but sometimes other combinations can be used to move the HDD line from the lowest to the higher location). After saving the settings by pressing the F10 (Save & Exit) key and confirming the saving of the parameters (Y or OK), the reboot will remain. If the problem was exactly this, it will disappear.
In extreme cases, in SATA HDD modes, you can set the IDE parameter instead of AHCI, which sometimes helps to fix the problem.
Hard Drive Problems
Worse things are, when the root cause isthe hard drive itself. It is possible that in this case the Missing operating system line may appear on the screen. What to do? Again, there may be several options, depending on the nature of the problem.
Let's start with the worst - the situation whenWinchester has become unusable or, as it is called, began to pour. It is usually impossible to fix a problem, however, as a last resort, you can try to reanimate the hard drive using the utility HDD Regenerator, which is said to be capable of reversing the hard drive.
Using the Shell
But if the hard drive is "alive", you can first check it for errors, and then perform a bootloader recovery or even completely overwrite the boot sector.
To do this, you must boot from anyinstallation or recovery schematic media by setting it in the BIOS parameters as the first device and calling the command line (usually a combination of Shift + F10 for quick access or one of the GUI menu sections).
First, the hard drive is checked forpresence of errors with automatic correction. To do this, enter the command chkdsk c: / x / f / r, and then enter the boot recovery lines bootrec.exe / fix mbr and bootrec.exe / fixboot.
After that, you can try to boot the system by removing the removable media.
If this does not help, a completeoverwriting the boot sector, only this time in the command console (again, when boot from removable media), the line bootrec.exe / rebuildbcd is written. But this option helps almost always.
In principle, the most basicsolutions that allow you to reanimate the boot of the operating system if the problems are not related to physical damage to the hard drive. However, this is not the only thing that can happen. The fact is that some viruses are also capable of causing such situations.
In this case, it is strongly recommendedTo check the entire computer system for threats, using utilities such as Kaspersky Rescue Disk or similar development from Dr.Web. Web. They need to be written to removable media and used as the first device for downloading (they have their own boot records). Such utilities, by the way, are able to detect even those deeply hidden viruses that ordinary standard scanners or security means in the running system are missing.