That said, some display-related symptoms may require professional help, especially if your computer is still under warranty. If your external display shows an image, you may have a faulty display to repair. ![]() Next, press the Fn + F4 function key four times to switch the image from PC Screen Only to Second Screen Only. Setting up an external display on a Windows computer is easy, but you will have to work in the dark here.Īssuming the laptop is powered on, hit the space bar and type the credentials to log in. If the issue persists, connect your laptop to an external display if available. If you hear fan noise, use the dedicated brightness keys on your keyboard to increase the brightness. Make sure the power button is lit and disconnect all the external devices connected to your computer. ![]() If the power supply is working, diagnose the system for screen issues.
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