Its a 32 inch polaroid it has hd and everything worked fine on my ps3

So i got my first xbox 360 yesterday and today i picked up my HD cords i have them working and everything but there is bad screen tearing and everything looks green is there anyway to fix it.

And i dont want to buy a wireless ruter for it right now

So im about to get a 360 and i have wifi connection in my house my internet connection runs through the phone lines will i be able to stick a ethernet cord into my phone lines to get connection for the 360 cause the wifi box is not connected in my room.