By Lily / Last update September 13, 2021

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The issue: loading operating system, disk boot failure

Disk boot failure is a common issue encountered by a lot of users. When it happens, the screen will display:

Loading Operating System ...

Boot from CD/DVD :


Disk Boot Failure

This message tells you that your PC cannot start because it cannot find the operating system. “Loading operating system, disk boot failure” can be caused by various reasons:

  • CD/DVD left in the disk reader

  • New hard drive installed

  • Faulty data cables

  • Incorrect boot sequence

  • Damaged hard drive

  • Corrupted system files…

I’ll show you how to fix “disk boot failure, insert system disk and press enter” accordingly in the next part.

How to resolve “loading operating system, disk boot failure” easily

According to the reasons, there are six quick fixes for your reference:

Fix 1: Check if there is a CD/DVD inserted to your computer

Open the optical disc drive on your computer to check if there is a CD/DVD. Remove the disk if you find one and try to boot your PC again.

Fix 2: Check if you have installed a new hard drive on your computer

Disk boot failure with a new hard drive is normal and can be repaired easily. Just insert the Windows installation CD into the PC, and then boot from the CD.

Fix 3: Check data cables and jumpers

Make sure the jumpers are properly set on the hard drive where Windows is installed. Re-plug the cables of the hard disk to see if it works. If it doesn’t work, you may replace the cables and try again.

Fix 4: Set your computer hard drive as the first boot device

1. Restart the computer and continuously press a specific key to get into BIOS. The key to open BIOS can be listed on the first screen that appears, before the Windows logo shows up. It is likely to be Esc, Del, F2, F8, F10 or F12.

2. Go to the Boot tab and move “Hard Drive” to the top of the boot order list by pressing “+” or “-”.

3. Press F10 to save changes and restart computer.

BIOS Setup Utility

Tips: Since every BIOS setup utility is different, the menu option or configuration item might be called Boot, Boot Options, Boot Order, etc. The boot order option may even be located within a general menu option like Advanced Options, Advanced BIOS Features, or Other Options.

Fix 5: Check hard disk errors with the CHKDSK utility

1. Insert the Windows installation disc and boot from it.

2. Navigate to Repair Your Computer > Troubleshoot > Advanced optionsCommand Prompt.

Command Prompt

3. In the Command Prompt window, type chkdsk C: /r and press Enter. You may replace C: with the letter of the drive where Windows is installed.

4. Type exit and press Enter to exit Command Prompt. Restart your computer to see if disk boot failure is solved.

Fix 6: Restore system from a restore point recorded on your PC

1. Insert the Windows installation disc and boot from it.

2. Navigate to Repair Your Computer > Troubleshoot > Advanced options > System Restore. Follow the System Restore wizard to finish the recovery process.

System Restore


Extra tips for solving disk boot failure in Windows 10/8/7

Apart from the error of “loading operating system, disk boot failure”, you may encounter other boot errors like “Error loading operating system”. Therefore, it is important for you to develop a good habit of backup. For example, a system backup will help to restore your computer to the previous working condition and a file backup will save you from possible data loss.

AOMEI Backupper Standard provides all-around backup solutions for you. There are four types of backup available: System/Disk/Partition/File Backup. With the Schedule feature, you can set your backup tasks to run automatically at fixed intervals. It also enables you to do block level incremental backup to improve the backup efficiency.

All Windows PC operating systems including Windows 10/8.1/8/7/Vista/XP are supported. Just download this freeware to have a try. 

Download Freeware Win 10/8.1/8/7/XP
Secure Download

To fix disk boot failure in Windows 10/8/7, you should do two things in advance:

1. Create bootable media to boot your computer.

Create Bootable Media

2. Perform system backup when the computer is in good condition.

System Backup

Wrapping things up

There are six quick fixes to the issue of “loading operating system, disk boot failure” offered in this article. Hope one of them works for you. You won’t be worried about different kinds of boot errors if you have created a bootable drive and performed system backup with AOMEI Backupper. It can also help you with the issue of System Reserved partition on a wrong drive and “Repairing disk errors” loop. Give it a shot and enjoy powerful data protection brought by it!