When the computer is powered on, it is usually because the system cannot find the bootable device. The common reasons and solutions are as follows: 1. Check whether the hard disk is recognized, enter the BIOS to see if the hard disk exists. If it is not recognized, it may be that the connection is loose or damaged, try to re-plug and unplug the hard disk cable; 2. Fix the boot record or partition table exception, use the Windows installation USB disk to enter the command prompt to enter the command prompt to run the bootrec /fixmbr, bootrec /fixboot, bootrec /rebuildbcd commands in turn; 3. Adjust the boot sequence setting error, enter the BIOS to set the hard disk (Windows Boot Manager) as the first boot item; 4. Change the hard disk mode settings (AHCI/IDE switch), try to switch the SATA Mode option in the BIOS and save the restart. Most cases can be solved through the above steps, without the need to send a repair or reinstall the system immediately.

The prompt "Windows not starting, no bootable device" is displayed when the computer is turned on, indicating that the system cannot find a device that can be started. In this case, don’t rush to send the system to repair or reinstall it. In many cases, it can be solved through simple operations.

Here are some common reasons and corresponding treatment methods:

1. Check whether the hard disk is recognized

This is one of the most common problems. Enter the BIOS (usually press the Del, F2, F10 and other keys when powering on) to check whether the system can recognize the hard disk.

• If you cannot see the hard disk in the BIOS, it may be that the hard disk connection is loose or the hard disk is damaged .
• You can try to re-plug and unplug the hard drive cable after shutting down, especially for desktop users.
• If it is a laptop, it is recommended to find a professional to help disassemble the machine and inspect it.

2. Boot record corrupt or partition table abnormal

Even if the hard disk is normal, if there is an error in the master boot record (MBR) or partition table, the system will fail to boot.

Common fixes:

• Use Windows to install USB drive to "Repair Computer" > "Troubleshooting" > "Advanced Options" > "Command Prompt"
• Then run the following commands in turn:

 bootrec /fixmbr
bootrec /fixboot
bootrec /rebuildbcd

These commands will try to fix boot-related issues. Note: Make sure that the operating system exists on the hard disk before execution.

3. Error setting of startup sequence

Sometimes the startup sequence is set incorrectly, such as the USB drive is plugged in but it is preferred to boot from the USB drive. After unplugging the USB drive, it does not adjust it back.

Solution:

• Enter BIOS (press the corresponding hotkey when powering on)
• Find the "Boot" or "Start" menu
• Adjust the boot sequence and put your hard drive (usually Windows Boot Manager) first

Save and exit and see if it returns to normal.

4. Hard disk mode settings do not match (AHCI/IDE switch)

If you have changed the hard disk mode before (such as changing from AHCI to IDE), the system may also fail to recognize the boot device.

How to deal with it:

• Enter BIOS
• Find "SATA Mode" or similar options
• Try changing to AHCI (if it was an IDE) or try it the other way around

Save and restart after changes. Sometimes you need to cooperate with the system registry modification to avoid blue screen.

Basically these common situations

When "No bootable device" appears, don't panic and check it step by step. Most of the cases are not that the hardware is broken, but that there is a problem with the setup or boot. If you have strong hands-on ability, you can directly use commands to repair it. If it really doesn’t work, then consider reinstalling the system or replacing the hard disk.

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