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What would cause a computer to display the “Missing Operating System” error message when I turn it on?

April 26, 2017cause Computer display Error message operating system turn

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What would cause a computer to display the “Missing Operating System” error message when I turn it on?

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Computer Doctor: The message “missing operating system” is displayed by your Master Boot Record (MBR) boot code after it reads the partition table (also contained in the MBR) to determine which partition is bootable and where it starts, and then reads the first sector, called the Volume Boot Record (VBR) of the partition (which contains the operating system boot code) and that sector doesn’t end with the signature bytes “55AAh”.