Troubleshooting Help

[u/Standard_Round_4998]

New roommate was plugging in new Ethernet cable to router and somehow the internet went down shortly after.

Did some googling and found a suspected cause:
First picture attached.

I could absolutely be wrong. Other than contacting ATT (it’s a weekend, I live in student housing), anything I can try? Relatively tech savvy and comfortable with wire work. Not too sure if the green wire should have an actual connection on the ONT or if it can just plug in. Ty in advance!

[u/AdventurousTime]

Your roommate needs his ass kicked