If it is not getting power then I would start with the ac/dc jack on the laptop.You can start with a muttimeter by measuring resistance and making sure you are getting a good connection. This jack seems to be soldered to the board so replacing it may take some elbow grease.
[https://www.youtube.com/watch?v=qcWowCgOFOw|Testing the Jack]
[https://www.youtube.com/watch?v=6q8avuyaZxg|Here] is a video on how to disassemble
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=== Update (01/09/2018) ===
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[https://www.youtube.com/watch?v=C1TEaZI83Uc|Here] is a video on desoldering the old jack and adding a new jack to the board.
If it is not getting power then I would start with the ac/dc jack on the laptop.You can start with a muttimeter by measuring resistance and making sure you are getting a good connection. This jack seems to be soldered to the board so replacing it may take some elbow grease.
[https://www.youtube.com/watch?v=qcWowCgOFOw|Testing the Jack]
[https://www.youtube.com/watch?v=6q8avuyaZxg|Here] is a video on how to disassemble