Maybe this has been talked about but I can’t find the thread. I have a 360 slim I bought about 6 months ago. But recently, I have experienced a grid of white dots on the screen. I have also noticed colored circles appear which are typically yellow and blue. I have switched out the component cable and the Av cable. I have had this problem with both cables. I know it is not the TV because I have no problems with the PS2. If any one knows anything about this I would appreciate advise on the problem. I have found a video on youtube of someone else you has experienced this. No one has helped, the people at Microsoft are useless.
Here is a link of a video I found: https://www.youtube.com/watch?v=_jPNUHbE5xQ