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Operating System not found or missing: Fix for Windows XP, Vista, 7, 8, 8

The following information on this error has been compiled by NeoSmart Technologies, based on the information gathered and reported by our global network of engineers, developers, and technicians or partner organizations.

Description and Symptoms

The error messages, alerts, warnings, and symptoms below are tied to this error.

Symptom 1: “Operating System not found” error screen on startup

When a PC is booting, the BIOS tries to find a operating system on a hard drive to boot from. However, if it is unable to find one, then an “Operating system not found” error is displayed. It may be caused by an error in BIOS configuration, a faulty hard drive, or a damaged Master Boot Record.

Another possible error message is “Missing operating system“. This error is also very common on Sony Vaio Laptops.

What causes no bootable devices found errors?

Put perfectly simply, a “no boot device found” error is caused when your PC can’t find a boot device.

That’s a little obvious, so let’s go into detail about what, exactly, it means for your PC to boot from a storage device. This is something that happens without issue every single time you start up your computer, except, obviously, when you encounter a startup error like this one.

A boot device is a storage device (a hard disk drive, a solid-state drive, etc.) or a partition on your storage device that clearly identifies itself to your computer’s BIOS (your motherboard’s firmware) as a bootable storage device. It identifies itself as a bootable device in two ways.

  1. The bootable storage device identifies itself to the BIOS. It says, “Hi, I’m a 250-gigabyte hard drive connected via SATA,” or, “Hi, I’m an eight-gigabyte flash drive plugged into the USB port,” and so on.
  2. Your motherboard keeps a prioritized list of all of the storage devices attached to your PC. The first device to tell BIOS that it’s a boot device (or, well, zeroth device, since machines tend to count from zero instead of one) is the one your PC will boot from. And which device is saying that is determined by certain bits of data in certain important places on the storage device’s boot sector or partition tables.
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That’s how your PC chooses a boot device. Or, at least, tries to. If it can’t successfully boot from the first device on the list, you’ve got a good chance of ending up with a “no boot device found” error message staring you in the face.

So now we know the immediate cause of these errors. Now we can go into which circumstances cause your boot device to stop identifying as a boot device.

Автоматическое восстановление загрузчика Windows

Процедура автоматического восстановления загрузчика, зашитая в среду восстановления Windows (WinRe), как правило, в таких случаях бессильна. Но попробовать все-же стоит:

  1. Загрузитесь с диска загрузочного диска, диска восстановления или установочной флешки с Windows 10;
  2. На экране установки нажмите кнопку Восстановление системы;
  3. Затем выберите пункт Поиск и устранение неисправностей ->Восстановление при загрузке и выберите ОС, загрузчик которой нужно попытаться восстановить;
  4. Но скорее всего результат будет отрицательный: Восстановление при загрузке не удалось восстановить компьютер

Замена кабеля SATA

Возможно старый SATA кабель (от материнской платы к винчестеру) поврежден, поэтому его следует заменить.

Осмотрите кабель питания, который подключается от блока питания к жесткому диску. Он и его контакты должны быть целы и плотно соединены с разъемом. При необходимости подключите другой кабель.

В некоторых случаях все кабеля питания могут быть повреждены, тогда помогает установка специальных переходников, которые можно приобрести на том же Aliexpress.

What causes no bootable devices found errors?

Put perfectly simply, a “no boot device found” error is caused when your PC can’t find a boot device.

That’s a little obvious, so let’s go into detail about what, exactly, it means for your PC to boot from a storage device. This is something that happens without issue every single time you start up your computer, except, obviously, when you encounter a startup error like this one.

A boot device is a storage device (a hard disk drive, a solid-state drive, etc.) or a partition on your storage device that clearly identifies itself to your computer’s BIOS (your motherboard’s firmware) as a bootable storage device. It identifies itself as a bootable device in two ways.

  1. The bootable storage device identifies itself to the BIOS. It says, “Hi, I’m a 250-gigabyte hard drive connected via SATA,” or, “Hi, I’m an eight-gigabyte flash drive plugged into the USB port,” and so on.
  2. Your motherboard keeps a prioritized list of all of the storage devices attached to your PC. The first device to tell BIOS that it’s a boot device (or, well, zeroth device, since machines tend to count from zero instead of one) is the one your PC will boot from. And which device is saying that is determined by certain bits of data in certain important places on the storage device’s boot sector or partition tables.
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That’s how your PC chooses a boot device. Or, at least, tries to. If it can’t successfully boot from the first device on the list, you’ve got a good chance of ending up with a “no boot device found” error message staring you in the face.

So now we know the immediate cause of these errors. Now we can go into which circumstances cause your boot device to stop identifying as a boot device.

Causes of this Error

This error has been known to occur as a result of one of the following causes:

Cause 1: Bad BIOS configuration

Since this error occurs when BIOS is unable to find the operating system, checking the BIOS settings first is often a good solution. The BIOS configuration can become incorrect because of power outages, hardware errors or errors made when configuring the BIOS manually.

Cause 2: BCD is damaged

Similar to the errors outlined in the BCD is missing and BCD is corrupt articles, this error can also appear when BCD becomes damaged.

Cause 3: Faulty data cables

If the BIOS is unable to detect the hard drive, the faulty data cables are often to blame. Try to unplug, and then plug them back, or even replace them altogether and see whether the problem persists.

Автоматическое восстановление загрузчика Windows

Процедура автоматического восстановления загрузчика, зашитая в среду восстановления Windows (WinRe), как правило, в таких случаях бессильна. Но попробовать все-же стоит:

  1. Загрузитесь с диска загрузочного диска, диска восстановления или установочной флешки с Windows 10;
  2. На экране установки нажмите кнопку Восстановление системы;
  3. Затем выберите пункт Поиск и устранение неисправностей ->Восстановление при загрузке и выберите ОС, загрузчик которой нужно попытаться восстановить;
  4. Но скорее всего результат будет отрицательный: Восстановление при загрузке не удалось восстановить компьютер

Восстановление MBR и файловой системы

Также ошибка no bootable device insert boot disk and press any key может указывать на поврежденную загрузочную запись «MBR». В таком случае ее нужно восстанавливать.

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Подробная инструкция на примере Windows 7:

  1. В первую очередь нужно установить в устройство загрузочный диск или флешку.
  2. Зайти в биос и изменить очередность запуска, выставив дисковод или флешку на первое место.
  3. Выбрать пункт «Восстановление…».
  4. Отметить нужную ОС Windows.
  5. Щелкнуть по строке команд.
  6. Затем поочередно выполнить три команды, первая: вводим bootrec /fixmbr и жмем «Enter».
  7. Следом за ней выполняем: bootrec /fixboot, нажав «Enter».
  8. И последняя позволит проверить файловую систему: chkdsk C: /F /R. Если Windows установлена на другом разделе, то замените букву «С» на букву вашего раздела.

Теперь все должно работать.

What causes no bootable devices found errors?

Put perfectly simply, a “no boot device found” error is caused when your PC can’t find a boot device.

That’s a little obvious, so let’s go into detail about what, exactly, it means for your PC to boot from a storage device. This is something that happens without issue every single time you start up your computer, except, obviously, when you encounter a startup error like this one.

A boot device is a storage device (a hard disk drive, a solid-state drive, etc.) or a partition on your storage device that clearly identifies itself to your computer’s BIOS (your motherboard’s firmware) as a bootable storage device. It identifies itself as a bootable device in two ways.

  1. The bootable storage device identifies itself to the BIOS. It says, “Hi, I’m a 250-gigabyte hard drive connected via SATA,” or, “Hi, I’m an eight-gigabyte flash drive plugged into the USB port,” and so on.
  2. Your motherboard keeps a prioritized list of all of the storage devices attached to your PC. The first device to tell BIOS that it’s a boot device (or, well, zeroth device, since machines tend to count from zero instead of one) is the one your PC will boot from. And which device is saying that is determined by certain bits of data in certain important places on the storage device’s boot sector or partition tables.

That’s how your PC chooses a boot device. Or, at least, tries to. If it can’t successfully boot from the first device on the list, you’ve got a good chance of ending up with a “no boot device found” error message staring you in the face.

So now we know the immediate cause of these errors. Now we can go into which circumstances cause your boot device to stop identifying as a boot device.

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