A laptop has a non-functioning keyboard. After the keyboard was replaced with a known good one, the technician finds that the keyboard still is not functioning. Which of the following steps should the technician take NEXT?（）A. Replace the motherboard.B. Check all connections.C. Replace the USB controller.D. Check the PS/2 connector.
A laptop has a non-functioning keyboard. After the keyboard was replaced with a known good one, the technician finds that the keyboard still is not functioning. Which of the following steps should the technician take NEXT?（）
A. Replace the motherboard.
B. Check all connections.
C. Replace the USB controller.
D. Check the PS/2 connector.
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