CompTIA A+ 220-902 Question F-37

A user reports that their PC boots up to a screen that reads “OS not found”. Which of the following would be the MOST likely cause of this problem?

A. There are conflicting operating systems.
B. Not enough memory is available.
C. The system has a BSOD.
D. The user has a USB key attached.

Correct Answer: D

Explanation:
Sometimes the computer mixes up the boot order. If the USB key is attached to the computer, try removing the USB key and rebooting the system.