So I have no clue at all but... I got an cable and an HDMI cable for my mac to use on the TV. And it used to look great. It'd be full screen, good quality and everything. Then after not doing this for a few weeks I plug it in and it doesn't fit the whole screen, my desktop background is still the same as before I updated it, and the quality is terrible. Some settings must be off, but I have no idea what.