Internet problems LAN cable

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   Ok, to start this long forum off... I recently just helped my friend build a pc on Christmas. He was on the fence about switching from pc to console. I told him not to worry about it, building a pc isn't hard. He was worried about all the things that could go wrong. I tried to assure him nothing would and it would be a breeze with my help. Oh boy was I wrong..
So the build went smooth, no problems. Turned on the pc, updated bios, then put windows 10 bootable drive in (home 64 bit). Windows installed perfectly, up until we got to the "Lets connect you to a network". This happened: 
https://media.discordapp.net/attachments/327200733738827778/402009224512798721/image.jpg?width=508&height=676
Windows refused to connect to the internet, I told him not to worry I told him skip that, go to windows home screen. So he got to the home screen, I told him to update all his drivers. Which he go from here:
https://www.asrock.com/mb/AMD/AB350M%20Pro4/index.asp#Download

He downloaded all the drivers. The drivers said they were properly working. Everything was there and up to date. Then, he proceeded to disconnect the LAN cable from the back of the PC, restart modem/router and pc. Turned it back on and at the bottom right the internet icon was yellow. Previously it was red, I guess it was because of drivers. He then clicked trouble shoot internet, got this as a result:
https://cdn.discordapp.com/attachments/327200733738827778/395570623717441538/image.jpg

So after this we did the ipconfig /release ipconfig /flushdns ipconfig /renew
Then he got this:  https://media.discordapp.net/attachments/327200733738827778/395659986983714817/image.jpg?width=902&height=676
After this then he manually tried to put in the submask, default gate away, and IP address. So after that he got this: https://media.discordapp.net/attachments/327200733738827778/396491563460460544/image.jpg?width=508&height=676
All this took us over 30 plus hours since dec 25. We tried contacting windows, they put the blame on comcast. Comcast told him to buy a new router, did so and still didn't work. Then comcast puts the blame back on windows. So i contact windows again and they tell me to tell my friend  to do a fresh start of windows, he does that still doesn't work. So, I contact windows again and they tell me its the motherboards manufactures fault. So after all the frustration since Christmas trying to help my friend put his pc together im here. Asking for help.

Also, somethings to include for context. We know its not the Ethernet cord because it works for his ps4 and mac. We know the LAN port isnt broken because the LED is on. Please help any help will be greatly appreciated. Also his specs are here: https://pcpartpicker.com/list/WGmY4C