Error Missing operating system: what to do?

You can imagine the amazement or even the shock of an ordinary user, the code he turns on the computer, and instead of loading the operating system, a message appears on the screen with the Missing line. What should I do? Windows does not boot. But after all, it would seem, yesterday everything worked as it should be. The reasons for this phenomenon can be quite a lot. But then the main methods are offered to eliminate such a malfunction, unless the hard drive itself has failed.

Why when booting the system computer writes: Missing operating system. What to do?

To begin with, why instead of starting the OS appears such a message. To find out the reasons and determine further actions, you just need to translate the message. It means that the operating system is lost or not found (sometimes the string “Operating system not found” is found, which is the same).

missing operating system what to do

That is, after checking the “iron” components, the primary BIOS system tries to transfer control of the operating system loader, but it is not detected. Why is this happening? Among the possible causes of this phenomenon are the following, the most characteristic:

  • incorrect sequence of devices for loading OS;
  • hard disk errors;
  • Windows boot loader corruption, boot sectors or records;
  • viral exposure;
  • hard drive failure.

Missing operating system: what to do with Windows 7?

No matter how trite it may sound, you should first check the cables that connect the hard drive to the motherboard. Perhaps the loose contact of the contacts was the reason for this phenomenon.

But suppose the system again returns the string Missing operating system. What to do? Windows 7 is installed or another system, in this case has absolutely no meaning.

missing operating system what to do windows 7

In such a situation, you need to check the sequence of installed boot devices. The situation is the simplest: a music disc is inserted into the optical drive, on which, naturally, there are no boot records, and the device itself is first in the boot list, after it is a USB drive, etc. Just install the hard drive in the Boot Sequence section (or Boot Priority) first, save the changes and restart.

Disk check

But this may not help, and the system will again display a message with the line Missing operating system. What to do in this case? Use the installation or recovery optical disk or USB-drive from which you want to boot, installing it in the BIOS first in the list of relevant devices.

missing operating system what to do windows

After the start, you need to go to the recovery section and use the command line, which is usually called through a combination of Shift + F10. It is necessary to prescribe the command to check the disk for errors chkdsk: / f / r / x (these attributes can be entered in any order). At the end of the process, if the failures are found and fixed, exit the command console and restart.

Note:It is possible that in some cases in the BIOS you will have to change the mode of the HDD SATA from AHCI to IDE.

Actions with boot entries

Worse, when it comes to the bootloader and everything connected with it. Damage to the records and sectors can also cause the Missing Operating System to appear on the screen. What to do in this situation? Again, boot from removable media and call the command line.

missing operating system what to do

Now you need to use a special tool for checking and fixing failures Bootrec.exe. The first after entering Bootrec.exe is separated by an additional / FixMBR command, and the second (also after entering Bootrec.exe with a space) - / FixBoot. When both commands are executed, exit the console and, as in the past, reboot the computer.

But what if the system again displays the Missing operating system string? What to do? Use the command line again and enter the boot sector rewrite command Bootrec.exe / RebuildBCD.And this, if everything is in order with the hard drive itself, absolutely guarantees the restoration of the system's performance.

Note: all three commands can be registered sequentially immediately.

Additional measures

These are in general terms the actions when the message Missing operating system. What to do to eliminate such a problem, I hope, is already clear. As additional measures, for example, under the influence of viruses, you can suggest to perform a scan from the boot disk of the Kaspersky Rescue Disk even before Windows starts. This utility is able to identify even those threats that are deeply embedded in the RAM.

writes the missing operating system what to do

If physical problems with a hard disk are observed, as a last resort (not to throw it out and reanimate all information), you can suggest the HDD Regenerator program, which, based on the statements of its creators, can completely remagnetize the surface of the hard drive. If this does not help, the hard drive will have to be changed.

It remains to draw the attention of any user to the fact that no third-party utilities to restore the system load in case of damage to the records, sectors and the bootloader itself will not help. Therefore, whether you like it or not, you will have to use command line tools only.

Related news

Missing operating system error: what to do image, picture, imagery


Missing operating system error: what to do 7


Missing operating system error: what to do 18


Missing operating system error: what to do 51


Missing operating system error: what to do 26


Missing operating system error: what to do 1


Missing operating system error: what to do 11


Missing operating system error: what to do 71


Missing operating system error: what to do 58


Missing operating system error: what to do 98