Take the back of the computer off and see if the fans run when you press the power button. Connect the computer to an external display if the fans are running and tell me if you see anything. Also, does the caps lock key light up when you press it?
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=== Update (11/13/2018) ===
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Nevermind the fan part. Try the external display and caps lock suggestions though.
Take the back of the computer off and see if the fans run when you press the power button. Connect the computer to an external display if the fans are running and tell me if you see anything. Also, does the caps lock key light up when you press it?