an operating system wasn't found try disconnecting any drives that don't contain an operating system.

This may help to understand what's going wrong:

After the BIOS or EFI (whichever your computer uses) has finished booting your computer, it hands over control of your computer to the operating system. In order to do that, it has to look for an operating system.

The first place it looks for an operating system is on the first partition of the first hard drive. Normally, the first hard drive is the one connected to the first SATA connector on the motherboard. If there isn't an operating system on the first partition of the first hard drive, the BIOS/EFI checks the next partition of the first hard drive, if there is a next partition, and so on.

If the BIOS/EFI can't find an operating system on the first hard drive, it will check the second hard drive - the one connected to the second SATA connector on the motherboard - and so on, until it finds an operating system.

Therefore, to ensure success Windows should be installed on the first partition of the first hard drive. If that isn't where you installed Windows, you're likely to run into the problem you have encountered.

The message you are seeing is asking you to disconnect hard drives that do not have an operating system - disconnect them from their data cable or remove them from the computer - so that the BIOS/EFI will find the hard drive that has Windows installed. But you don't have to go that far.

If you installed Windows on the second or a subsequent hard drive, you can enter the BIOS or EFI and change the order of the drives it checks for an operating system. So, for example, you can tell the BIOS/EFI to look first in the second hard drive for an operating system. That's easier than physically moving drives around inside your computer, although that would be the best course of action because it maintains the way computers are typically setup at the factory.

To further illustrate I have included an image of the Disk Management utility that I found on the internet. The 'first' hard drive is called Disk 0. If you have a newer computer with EFI, the first partition on Disk 0 is actually the EFI itself and the next partition right after is where Windows is ideally installed. That's what we mean by the 'C: drive.'

Hi konstantine

This could be a potential sign of a defective drive. Do you have access to a working spare SSD or mechanical hard disk you could try using to isolate the problem?

Thank you for your help!

This SSD is Silicon Power S55 120gb TLC

here are the screenshots

To evaluate the computer environment please post logs for troubleshooting.

Using administrative command prompt copy and paste this whole command.

Make sure the default language is English so that the logs can be scanned and read.

Choose the applicable link for the operating system:

https://www.tenforums.com/tutorials/3813-language-add-remove-change-windows-10-a.html

https://www.eightforums.com/threads/language-add-or-remove-in-windows-8.5849/

https://www.sevenforums.com/tutorials/87317-display-language-change.html

The command will automatically collect the computer files and place them on the desktop.

Then use 7zip to organize the files and one drive, drop box, or google drive to place share links into the thread for troubleshooting.

https://support.office.com/en-us/article/Share-OneDrive-files-and-folders-9fcc2f7d-de0c-4cec-93b0-a82024800c07

This command will automatically collect these files:  msinfo32, mini dumps, drivers, hosts, install, uninstall, services, startup, event viewer files, etc.

Open administrative command prompt and copy and paste the whole command:

copy %SystemRoot%\minidump\*.dmp "%USERPROFILE%\Desktop"&dxdiag /t %Temp%\dxdiag.txt&copy %Temp%\dxdiag.txt "%USERPROFILE%\Desktop\SFdebugFiles"&type %SystemRoot%\System32\drivers\etc\hosts >> "%USERPROFILE%\Desktop\hosts.txt"&systeminfo > "%USERPROFILE%\Desktop\systeminfo.txt"&driverquery /v > "%USERPROFILE%\Desktop\drivers.txt" &msinfo32 /nfo "%USERPROFILE%\Desktop\msinfo32.nfo"&wevtutil qe System /f:text > "%USERPROFILE%\Desktop\eventlog.txt"&reg export HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall "%USERPROFILE%\Desktop\uninstall.txt"&reg export "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components" "%USERPROFILE%\Desktop\installed.txt"&net start > "%USERPROFILE%\Desktop\services.txt"&REM wmic startup list full /format:htable >"%USERPROFILE%\Desktop\startup.html"&wmic STARTUP GET Caption, Command, User >"%USERPROFILE%\Desktop\startup.txt"

There is one file for you to find manually:  dxdiag:  

In the left lower corner search type:  dxdiag > When the DirectX Diagnostic Tool opens click on the next page button so that each tab is opened > click on save all information > save to desktop > post one drive or drop box share link into the thread

et us first check the disk.

Download and run HDTune .

http://www.hdtune.com/

Select the Disk where OS is installed.

Make screenshots of the following

the health

the error scan

the benchmark

Post back the screenshots.

Disclaimer:

This is a non-Microsoft website which would provide accurate and safe information. Watch out for ads on the site which are frequently classified as a PUP (Potentially Unwanted Products). There is no need to buy paid products to fix your computers as they do more harm than good sometimes.