XBOX ONE WON'T DISPLAY ANYTHING BUT LOW-RES (640 X 480)? ("No signal" issue?) PLEASE HELP

Out of nowhere today my Xbox stopped connecting to my tv when I booted it up. I was getting the "No signal" message.

I did all the fixes (powered down, unplugged, etc.). I managed to get it to boot up and display in low res (640 x 480) but when I go to the settings to switch back to HD, the screen flicks off and goes back to "No signal". I can't even get it to go 720p.

I've checked the cables, even replaced the HDMI cable I'm using for the xbox and nothing. I thought maybe it's the tv that's going (7yr old Sony Bravia) but it has no problems whatsoever displaying my HD cable.

Anyone have any thoughts? THANKS IN ADVANCE!

Submitted by mickyrow42 Xbox 720 Release Date 2015