Monitor Connected to Mac Not Displaying I have an TV which accepts a DVI and VGA input, and a retina macbook pro with Mini Display Port and HDMI. I needed to connect my mac to the monitor so I decided to go for an HDMI to DVI cable since it was cheaper than the Mini Display Port one. 

When I plugged my mac into the monitor, the mac's screen flashed and the discrete gpu was activated, which would seem to indicate that it is attached to an external monitor. However, the monitor does not display an image and in a few seconds says that it is "entering power save mode" (when nothing is connected it does not display this, indicating that it detects that something is connected). 

I tried using boot camp to see if that would help but there was no difference. I also tried an older mac. It did not have an HDMI port, but I had a Mini-Dvi to HDMI adapter. Again, nothing displayed.

I thought that it might be an issue with the inputs or the cable, but I connected an Xbox 360 to it and it displayed perfectly, so it must have to do with the mac

Any possible fixes to this issue?
You could use the ColorSync Utility.app located in your Utility folder.

It will tell you all about the monitors connected and the mode they are using.

Check the profile used for your TV and if it is the correct one, the run a profile repair.