An operating system wasn't found error

Windows 10 pro was installed and NO hardware changes were done.

Dell Vostro 3000 core i5 7th gen

SameerQuadri,

What is the computer model and Operating System installed?  Were any hardware or software changes done to the computer prior to the error?

SameerQuadri,

Change or reset the BIOS configuration

Since this error often occurs when BIOS is unable to find the hard drive, checking BIOS settings might be a good solution.

To check the BIOS settings, follow these steps:

1. Restart the computer
2. Press the F2 key to open BIOS menu.
3. Check the BIOS’ main screen to see whether it detects the hard drive, and the boot order to see if it is set correctly.

Verify that the hard drive is the first boot device.

If the hard drive is not detected properly, consider replacing the data cables, or resetting the BIOS settings to default values. Here are the steps to reset BIOS settings:

1. Enter the BIOS screen by following the steps outlined above
2. Find the “Reset to default option.
3. Choose the reset option, and answer “Yes” when prompted for a confirmation
4. Then, select the “Exit -> Exit saving changes” option.

Run Automatic Repair
The Windows Automatic Repair may recover certain boot process related errors in some cases. Here are the steps to access the Automatic Repair. Start the computer 3 times and the auto repair option should appear.

1. Click Next in the setup page after selecting proper language, time and keyboard input
2. Click Repair your computer and select Troubleshoot
3. Click on Advanced options
4. Select Automatic Repair and select your operating system.

If you still cannot get back to Windows run the diagnostics on the hard drive. To start the diags start the computer and tap F12. Choose the diagnostics option.

Bios is not opening

Same problem on the dell I have as well

Internal   hard  disk  not  found