So on my friend's computer, his RJ45 jack stopped working. I thought maybe it got shut off in the BIOS, even though it just stopped working while using the computer. Its not the cord it self as when he plugs it into his xbox 360 he geting connectivity. When he tries a different ethernet cord he still doesn't get anything. So he brought it to my house, and plugged it in here still nothing. I really don't know what to do at all.