I have an Xbox 360 S but I've never had mine freeze before. However, I think I might have a solution to the Red Dot. I saw in a video that the red dot is caused because the console has a problem detecting the hard drive. The guy in that video said that "The Xbox was pushed a lot during transit and it won't work because of that" and you might have shaked or moved it to convey the same error. In the video, he took the hard drive out and put it back in again, and that seemed to do the trick. I hope that solved it! :)