Quick Answer: How Do I Fix Missing Operating System Without CD?

Method 1: Repair MBR disk with Windows installation disk

  • Press the “Power” button to turn on PC > Hit “Enter” when Boot from CD prompt.
  • Press “R” key in Windows Setup Menu to start the Recovery Console.
  • Type: FIXMBR at the C:\> prompt and hit “Enter”
  • Press “Y” key > hit “Enter” when asked if you want to write a new MBR;

How do I fix missing operating system?

5 Solutions That May Help You Get out of Missing Operating System Error

  1. Solution 1. Check If Hard Drive Is Detected by BIOS.
  2. Solution 2. Test Hard Disk to See Whether It Failed or Not.
  3. Solution 3. Set BIOS to Default State.
  4. Solution 4. Rebuild Master Boot Record.
  5. Solution 5. Set Correct Partition Active.

How do I fix operating system not found without CD?

Fix #2: Change or reset the BIOS configuration

  • Restart the computer.
  • Press the necessary key to open BIOS menu.
  • If the screen shows multiple keys, find the key to open “BIOS”, “setup” or “BIOS menu”
  • Check the BIOS’ main screen to see whether it detects the hard drive, and the boot order to see if it is set correctly.

Why did my operating system disappear?

The main reason why operating system is missing is because of the damage of MBR, so take the method 1 as its instructions to repair it. If this method doesn’t work, running a disk check to fix bad sectors which will affect your system files loading, or running bootsect command at Command Prompt to repair boot crash.

How do I fix missing Dell operating system?

How to fix “Missing operating system” error

  1. Way 1. Check cables for the hard drive holds OS.
  2. Way 2. Check and adjust the BIOS settings.
  3. Way 3. Fix MBR with or without Windows installation disc.
  4. Way 4. Set the partition that holds operating system active.

What happens if there is no operating system?

When you start a computer without an OS it will show a message, something similar to this: “no bootable device, insert disk and press any key”. If the computer happens to not have a ROM chip, it will do nothing, even if you have a cd to boot from. It will turn on, but there will not be anything for the computer to do.

How do I install operating system?


  • Insert the installation disk or flash drive.
  • Restart your computer.
  • Wait for the computer’s first startup screen to appear.
  • Press and hold Del or F2 to enter the BIOS page.
  • Locate the “Boot Order” section.
  • Select the location from which you want to start your computer.

Where is Bootmgr located?

The BOOTMGR file itself is both read-only and hidden. It is located in the root directory of the partition marked as Active in Disk Management. On most Windows computers, this partition is labeled as System Reserved and doesn’t have a drive letter.

How do I fix boot device not found Please install an operating system?

To fix boot device not found 3F0 error, follow these steps:

  1. Press the Power button to start the computer, and immediately after this, repeatedly press F10 key to enter the BIOS setup menu.
  2. To load and restore BIOS Setup Default settings, press F9 on the BIOS setup menu.
  3. Once loaded, press F10 to Save and Exit.

Can a computer run without operating system?

You can, but your computer would stop working because Windows is the operating system, the software that makes it tick and provides a platform for programs, like your web browser, to run on. Without an operating system your laptop is just a box of bits that do not know how to communicate with one another, or you.

How do you reset the BIOS?

Method 1 Resetting from Within BIOS

  • Restart your computer.
  • Wait for the computer’s first startup screen to appear.
  • Repeatedly tap Del or F2 to enter setup.
  • Wait for your BIOS to load.
  • Find the “Setup Defaults” option.
  • Select the “Load Setup Defaults” option and press ↵ Enter .

How do I restore my Windows 10 operating system?

Reset or reinstall Windows 10

  1. Option 1: Select Start > Settings > Update & Security > Recovery.
  2. Option 2: Restart your PC to get to the sign-in screen, then press and hold down the Shift key while you select the Power icon > Restart in the lower-right corner of the screen.

How do I boot into recovery mode?

How To Access Android Recovery Mode

  • Turn off the phone (hold power button and select “Power Off” from the menu)
  • Now, press and hold Power+Home+Volume Up buttons..
  • Keep holding until device logo shows up and phone restarts again, you should enter recovery mode.

What is Dell operating system?

Microsoft Windows Server Operating System Support

Dell EMC collaborates extensively with Microsoft to ensure the consistent, reliable performance of Microsoft operating systems running on Dell EMC PowerEdge servers.

How do I find out what operating system I have on my Dell laptop?

Find operating system info in Windows 7

  1. Select the Start. button, type Computer in the search box, right-click on Computer, and then select Properties.
  2. Under Windows edition, you’ll see the version and edition of Windows that your device is running.

Can be load operating system when HDD not connect?

Cause 2: The hard drive partition is damaged

The hard drive’s partition may become damaged because of disk write errors, power outages or virus attacks. If that’s the case, the operating system cannot access the system files to boot properly and the loading process is halted.