单选题If an external monitor is attached to a laptop and it does not work， which of the following actions should a technician take FIRST？（）ARe-install the operating system.BOpen and close the cover.CUse the function key to activate the monitor.DInstall new software for the keyboard.
单选题
If an external monitor is attached to a laptop and it does not work， which of the following actions should a technician take FIRST？（）
A
Re-install the operating system.
B
Open and close the cover.
C
Use the function key to activate the monitor.
D
Install new software for the keyboard.
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