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[Vr5fx]

Check all the pins on the cable, if they all seem to be good, gently wiggle the AV connection at the back of the Xbox while it is on. If there is no change prehaps your GPU is starting to go up the creek.

[GreatMightySymp]

(Seems I can't edit my reply, so I'll post this here.)

Checked it again using Tales of Vesperia, I can see the dark areas (at least make them out, compared to before when it was so dark I couldn't make out anything), but the entire screen has an even heavier green hue to it (where only blue can be made out normally, everything else is a shade of green).

So it's apparently getting worse if it's doing that now, I'd assume.

(Gonna try seeing if I can check it using another TV's component cable hookups or even an HDMI soon, but it's looking like this might be the Xbox. >.>)

[Vr5fx]

See if you can get yourself another cable to test it. Or even borrow someone elses TV to test the HDMI. Has your xbox been opened? Any fixes done to it?

[Vr5fx]

Then the issue lies with the Xbox. Either there is a faulty connection in the socket or you have a funky issue with the GPU. See if you can test out the HDMI.