I'm having problems with connecting my retina MBP with external displays of all kinds. The DisplayPort->VGA adapter has a 1/4 success rate. The HDMI port (via a DVI adapter) does not see my monitor.
These monitors all work with every other laptop (Mac, Windows and Linux), including my old pre-unibody MBP. Worst of all, I cannot depend on this laptop to make presentations, because it's often failed to connect to projectors.
How can I debug these problems? I don't see any obvious way to resolve issues when automatic discovery fails.