First check if the cable is OK, then also check if the switch on the cable is in HDTV or TV deppends on your TV, then if all is fine, then you'll have to check inside the xbox and see if the heatsink of the GPU has thermal compound on it. If not put something like ARTIC themal compound on it, and see if that works. Hope it help.
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power everything down, insert LAN cable into rear of 360, other end into appropriate port on PC or laptop, boot up PC/laptop, get internet connection, open browser, now turn on your 360, you should now have local area network up and running, at dashboard connect to live and sing into your account.
If you're talking about browsing the internet (like checking your email or going on websites), you can't do that with the Xbox 360. If you mean going onto the Xbox 360 online community known as Xbox Live then you need to register a gamertag (meaning your login/display name) from your Xbox menu.
Yes, your cord sounds like it has become damaged, replacing it is not too costly in most cases, unless you have to have it mailed to you. If the cable was kinked or pinched at anytime, you can damage the wiring on the inside of the cable, making the picture either not come at all, or badly distorted because the signals are not coming through properly.