The screen of a previously working computer repeatedly displays an OS Not Found error message when the computer is started. Only a USB drive, a keyboard, and a mouse are plugged into the computer…

The correct answer is C. Check boot options. An "OS Not Found" error most commonly indicates the system isn't booting from the correct device. Verifying and correcting the boot order (ensuring the internal hard drive is prioritized over USB or other entries) is the quickest first step before making any changes to the disk…

Submitted by klara.se· Mar 30, 2026Hardware and network troubleshooting

Question

The screen of a previously working computer repeatedly displays an OS Not Found error message when the computer is started. Only a USB drive, a keyboard, and a mouse are plugged into the computer. Which of the following should a technician do first?

Options

ARun data recovery tools on the disk.
BPartition the disk using the GPT format.
CCheck boot options.
DSwitch from UEFI to BIOS.

How the community answered

(34 responses)

A
12% (4)
B
24% (8)
C
59% (20)
D
6% (2)

Explanation

An "OS Not Found" error most commonly indicates the system isn't booting from the correct device. Verifying and correcting the boot order (ensuring the internal hard drive is prioritized over USB or other entries) is the quickest first step before making any changes to the disk or firmware

Topics

#boot options#boot order#OS not found#BIOS UEFI

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