I bought a white Xbox one S used the person I bought it from said it worked fine and I saw it running with my own eyes. When I brought it home and plugged it in it turned on started in a timely fashion ran well but my screen was covered in artifacts and the display was too small to fill the screen. So I went to my settings and changed the resolution from 480p to 1080p and it immediately displayed no signal on my TV. I waited about 30 minutes and then tried hard resetting my xbox. Still no display, I changed HDMI cords to one that worked on my old xbox 1 and used all three different ports in my TV, it is in the port that goes to the TV and I flipped the cord around ETC. I tried starting it up in low resolution mode this did not work. The screen is not black my TV says no signal. My xbox seems to be working fine turns on and off normally. Please help I just bought this yesterday