You're troubleshooting a malfunctioning notebook computer. Nothing appears on the LCD display when the system is powered on. When you connect an external monitor to the system, the windows desktop is displayed properly on the monitor. What could be causing this problem? (Choose two)

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1. You're troubleshooting a malfunctioning notebook computer. Nothing appears on the LCD display when the system is powered on. When you connect an external monitor to the system, the windows desktop is displayed properly on the monitor. What could be causing this problem? (Choose two)