Question

1. after a motherboard replacement, the system powers on but usb keyboard and mouse are unresponsive during windows installation. what should the technician do next? a) enable legacy usb support in the bios b) replace the cmos battery c) reinstall the cpu d) use ps/2 adapters for all devices

Explanation:

When a motherboard is replaced, the BIOS settings are often reset. Legacy USB support in the BIOS needs to be enabled for USB devices (like the keyboard and mouse in this case) to work properly during the Windows installation or boot - up process. Replacing the CMOS battery (B) is for issues related to BIOS settings not being saved over time, not an immediate fix for non - working USB devices after a motherboard replacement. Reinstalling the CPU (C) is unrelated to USB functionality. Using PS/2 adapters (D) is a workaround but enabling the proper BIOS setting (A) is the more appropriate first step as it addresses the root cause of the USB support issue in the system's firmware.

Answer:

A. Enable legacy USB support in the BIOS