How to solve the problem that boot device not found please install an operating system?

I. What causes the display of No boot device found when the computer is turned on?

Usually, when the boot sequence in the BIOS settings is incorrect or the system cannot detect the hard disk, an error message of “no boot device found” will appear. Once this error occurs, the user will not be able to start the computer normally, and may even take a long time to load or fail to load.

There are many reasons for this error, which can be roughly divided into the following categories:

● Hard disk connection problem

●The hard disk is damaged

●Incorrect boot sequence in BIOS

● Corrupted MBR

Although the cause of this error may seem complicated, it is not difficult to solve it. Before we officially fix this fault, if you have saved important files in your computer, we recommend that you use a professional system rescue tool to try to transfer or restore the important data, and then refer to the third part of the article to fix the error.

II. Use Renee PassNow to transfer or recover important data before repairing

1. What is Renee PassNow?

Renee PassNow is a professional system rescue software, which can help Windows users clear Windows account passwords, create new administrator accounts; restore disk/memory card data, recover data after hard disk formatting; transfer disk files; erase or scan Disk files, etc. In addition, this software also supports repairing Windows system problems, such as: repairing MBR boot records, DBR error parameters, 0xc00000e, Windows system startup failure, and some problems that cause black screen or blue screen, etc. As a system rescue tool with various functions, it is perfectly compatible with multiple systems including Windows 10/8.1/8/7/XP/Vista, and can meet the system rescue needs of different users.

2. How to use Renee PassNow to transfer or recover data?

Since the computer cannot be started and used normally, you can create a startup disk through Renee PassNow, then start the computer through the startup disk, and then use the data recovery function provided by the software to recover. Specific steps are as follows:

Step 1: Download and install Renee PassNow on other computers that can log in and run normally, then connect the U disk to the PC, run Renee PassNow, and then check in “Step 1: Select creation method” (Create a Live USB) option. (Note: Before performing this operation, please make sure that the important files in the U disk have been saved in other locations, because the operation process will delete all the data in the U disk.)

Step 2: Next, select (x64) or (x86) according to the system type, click the (Download Now) button to download the ISO file, click the (Create a Live USB) button after the file is downloaded, and click the (Eject USB) button.

Step 3: Connect the created boot device to the computer that needs to transfer data, turn on the computer, and then the shortcut key to enter the BIOS will be displayed on the computer screen (the display time of this interface is very short, maybe only one or two seconds), click continuously BIOS shortcut key to enter the BIOS setting interface, and then set the boot U disk as the first in the boot sequence in Boot Priority, then save the settings and restart the computer.

Step 4: Wait for a while, after Renee PassNow is loaded, select (Data Transfer). If you need to transfer the data of the entire hard disk, you can select the (Data Backup) option.

Step 5: You can click on each disk drive letter (C/D/E/F, etc.) to check whether important files are lost. If not, it is recommended that you transfer them to an external disk. The operation of transferring data is very simple. For example, if you want to transfer the data in the C drive to the G drive, you can first select the C drive on the upper left, select the G drive on the upper right, and then select the files in the C drive, and click the Copy function button in the middle. Disk data can be easily transferred. If there is a file you want to delete, you can also click the (Delete) button in the middle after selecting the file, but the deletion operation cannot be undone, please operate with caution.

Step 6: If you find that there is data loss, please select the (Undeleter) option on the main interface of the function, and click the (Run) button.

Step 7: Select (Fast Partition Scan) to scan the target hard disk.

Step 8: After the scan is complete, select the file to be recovered, click the (Recover) button to execute the data recovery command, please save the file in another external disk, eject the U disk after the recovery is complete, and then perform other operations on the computer, such as maintenance , replace the hard disk or reinstall the system, etc.

The above are the detailed steps to transfer or restore data. Next, let’s continue to learn how to fix the “No boot device found” displayed on startup.

III. How to fix the error No boot device found displayed when the computer is turned on?

1. Reconnect the hard disk

When you encounter the error “No boot device found”, it is recommended to try to reconnect the hard drive first. First turn off the computer and unplug the power cord. If it is a laptop, you can take out the battery first, then disconnect the hard disk device and try to reconnect the hard disk device. After the operation is complete, run the computer again to see if the problem is resolved. It should be noted that if you are not familiar with the operation of hard disk disassembly, please do not dismantle it by yourself, and seek help from professionals or maintenance organizations.

2. Restore BIOS default settings

When the boot sequence in the BIOS settings is incorrect or the system cannot detect the hard disk, the error “No boot device found” will appear. Therefore, you can try to restore the BIOS default settings to solve this problem. The specific steps are as follows:

Step 1: Turn on the computer, and immediately press the F2 or F10 or Esc or Del key several times to enter the BIOS menu (the shortcut keys to enter the BIOS are slightly different due to the different models of the computer motherboard, and you can observe the black screen that appears when starting up. prompt).

Step 2: Then press the key F9 (Setup Defaults) to restore the BIOS default settings. For other BIOS interfaces, try to find the option that includes “Defaults”.

Step 3: Press the key F10, select Yes and press the key Enter to save the changes. Then restart the computer to see if the problem is resolved.

3. Run the chkdsk command to repair bad sectors on the hard drive

“No boot device found” issue can occur when bad sectors appear on the hard drive. So we can use the chkdsk command to check and repair hard disk errors. When the device cannot be started normally and the system cannot be entered, it can be repaired in the Windows recovery environment. The specific operation steps are as follows:

Step 1: Press and hold the power button for 10 seconds to turn off your computer device. Press the power button again to turn on the device. Immediately after you see Windows start up (for example, some devices display the manufacturer’s logo as they start up), press and hold the power button for 10 seconds to shut down your device.

Step 2: Press the power button again to turn on the device. When you see Windows start up, press and hold the power button for 10 seconds to shut down the device.

Step 3: Press the power button again to turn on the device. This time, allow the computer to fully boot. Select Advanced Options in the Automatic Repair interface. You will then enter the Windows recovery environment.

Step 4: After entering the recovery environment, select Troubleshooting > Advanced Options > Command Prompt.

Step 5: Next, in the command prompt window that opens, enter the command chkdsk X: /r /f (X refers to the hard disk drive letter that needs to be repaired; /r and /f are chkdsk parameters, and /r can find bad sector and restore readable information; /f will try to fix all errors on the disk), and press (Enter) to fix errors. After the fault repair is complete, restart the computer to check whether the problem is resolved.

4. Use the Bootrec command to fix errors

The Bootrec command can repair corrupt master boot records or boot configuration data files. This method needs to enter the recovery environment to operate. Proceed as follows:

Step 1: Enter the recovery environment by repeating the Force Shutdown or by clicking on Repair Your Computer on the interface Install now.

Step 2: After entering the recovery environment, select Troubleshooting > Advanced Options > Command Prompt.

Step 3: In Command Prompt, enter the following command. Each time you enter a command, you need to press the Enter key. After the repair is complete, restart the computer to see if the problem is resolved.

bootrec.exe /fixmbr

bootrec.exe /fixboot

bootrec.exe /scanos

bootrec.exe /rebuildbcd