单项选择题
A user states that they are trying to project their laptop to a screen for a presentation. They have plugged the projector cable into their laptop, and turned the projector on, but no signal is found. Which of the following should the technician perform FIRST?（）
A. Ensure the projector is receiving power
B. Verify the laptop is not running on battery
C. Toggle the function key for displays
D. Replace the projector cable with another
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