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 n

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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？（）

Re-install the operating system.

Open and close the cover.

Use the function key to activate the monitor.

Install new software for the keyboard.

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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 n

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