Press the CapsLock or NumLock key and check whether the status light for the key turns on.
If the status light turns on:
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When you're using a device with a keyboard connected to it, select Windows logo key + Ctrl + Shift + B. If you’re in tablet mode, press the volume-up and volume-down buttons simultaneously three times within two seconds. If Windows is responsive, you’ll hear a short beep and the screen will blink or dim while Windows attempts to refresh the screen.
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When you're using a desktop PC, select Ctrl + Alt + Delete, select an account, and sign in. If you can’t sign in, select Start > Power > Restart on the screen. If you don’t see Start on your screen, press and hold the power button on your PC for 10 seconds to turn it off. Then press and release the power button to turn your PC back on.
If the status light doesn't turn on:
Press and hold the power button on your device for 10 seconds to turn it off, then unplug your adapter. After 30 seconds, plug your adapter back in and restart your device.
