Newly Reformatted Comp can’t connect to Internet

Recently my dad got a new computer, and he’s giving me the old one. He told me to reformat, and after doing so, I discovered it wouldn’t connect to the Internet!

I’ve tried several fixes, but none of them have worked. I believe that the Computer is at at fault, not the modem or network adapter. When I plug the ethernet cable into the other computer it works fine (I’m using it to post this).

Apparently my dad had a problem like this before, and solved it without the Internet (since we only had the one computer), so I know I don’t need to download drivers.

I assigned a static IP address but it didn’t work; also can anyone tell me how to configure the DHCP scope?

Do you guys have any suggestions what to do?
I’m technically savvy, but I haven’t worked with networking really, so step by step would be appreciated.