单项选择题
A technician has installed a new motherboard in a workstation, but after hardware tests, themotherboard has failed. Which of the following should the technician do FIRST before replacingthe motherboard? （）
A. Reseat all power connections.
B. Remove the CMOS battery.
C. Install the graphics card.
D. Ground to the case.
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A. Install a new operating system
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