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单选题
A technician is troubleshooting a monitor displaying a blank screen and the power indicator light ison. Which of the following should the technician do next?（）
A
Test the computer with a known-good monitor.
B
Check if the monitor is still covered under the manufacturer’s warranty.
C
Replace the monitor’s power cord with a known-good power cord.
D
Swap out the computer’s video card.
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The contrast setting needs to be raised from the default.B
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Router#copy tftp flashB
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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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