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?
- A. Run data recovery tools on the disk.
- B. Partition the disk using the GPT format.
- C. Check boot options. Correct
- D. Switch from UEFI to BIOS.
Explanation
A connected USB drive often causes the firmware to try booting from it first, producing an OS Not Found error even though the internal disk is fine. Checking the boot options (boot order, or removing the USB drive) is the quick, non-destructive first step. Repartitioning destroys data, switching firmware mode can stop a working install from booting, and data recovery is premature.
