Good day.I want to repeat the question you are trying to get solutions from: As I perceived, the time when you reboot your PC the message appears with this line, "Operating System, not found!
One of the many reasons why you get this message in you PC is the computer has detected a defective hard drive.
What you can do is, execute a restart and strike any key that is according to the kind of computer you have like strike F12 for DELL PC.
When you have already came in to CMOS, check if your HDD is being detected. Whe it is not in the list, then that is the cause of the problem.
One of the ways how to let the BIOS detect the HDD is to let your provider's licensed technician to open and tighten the connection from the Motherboard to the HDD. But if the CMOS doesn't detect the HDD then it must be replaced or whatever the technician's recommendation for your PC.
Thanks.
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