Solve : My pc wont turn on help!!?

1.	Solve : My pc wont turn on help!!?
Answer» IM helping my friend build a pc but it wont TURN on im not sure what to do since where barely know anything we just FOLLOWED the parts by this youtuber https://www.youtube.com/watch?v=5NenE-bgxzw theres something about switch CONNECTORS and idk what he means by it https://www.google.com/search?q=dell+optiplex+790+pinout+diagram&tbm=isch&ved=2ahUKEwjd7s_Z3LHoAhUBf6wKHWdjCnQQ2-cCegQIABAA&oq=dell+optiplex+790+pinout+diagram&gs_l=img.3...11156.11760..13077...0.0..0.67.227.4......0....1..gws-wiz-img.TREnk6kD-WE&ei=x0J5Xp3vC4H-sQXnxqmgBw&bih=757&biw=1600#imgrc=kLvO78fz221DyM

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