Someone in my household with little electronic experience tried setting up an audio system while I was away on a trip. They attempted to set up the xbox to play through the audio system (some older yamaha system), but the audio did not work. So they unplugged it all, and put it "back to normal." They turned it back on, however, and the screen had a reddish-pinkish tint with occasional horizontal lines passing through, and some areas seemed "shaky." The audio also does not work at all.We are using an hdmi cord, and have tried using multiple different cords: new, old, and ones from currently working appliances. Still no help. So, we tried switching ports, thinking that maybe the port was broken. The old port played cable television perfectly, the new port still produced the red xbox screen. So, we figured the xbox itself was broken. But I've tested it with another HDTV, it worked fine. I've tested it with our computer monitor, it worked fine.
I've tried setting all audio and video settings to auto, optimal, etc. I've held the trigger and Y button to reset the settings to default. I've gotten no red error lights, nor error messages. The console is in a well ventilated area, and has never had issues before. And it obviously works fine, as there were no issues on other TVs/monitors. I've sifted through the forums, but they all point to "the cable is bad" or "the xbox is broken" and I don't think that's it.
Any help is appreciated.