A technician has upgraded the BIOS of a system that is running with multiple hard drives. Afterward, the system will not boot and displays an error message -Operating system

not found-. Which of the following is the FIRST thing the technician should inspect?

A. The hard drive type settings in the BIOS

B. The power supply connections to the hard drives

C. The boot sequence settings in the BIOS

D. The motherboard SATA connector

s

Explanation: