![]() I'm guessing that there is something going wrong with the graphics chip or HDMI interface logic. My best guess is heat (if I leave the box off for a long while it starts working again) but everything I've tried to control heat hasn't worked. I took the same cable, connected it to a HDMI-Thunderbolt adapter, plugged it into the Thunderbolt port and it comes right up. The system is in the state where it is ignoring the HDMI port, and I did the following test: using a Belkin HDMI cable to a 1080p monitor with an HDMI port, I connected it to the Mini's HDMI port and nothing. I never have an issue with the display connected to the Thunderbolt port. Rebooting doesn't help, although if I leave the system off for a while, it will sometimes come back. ![]() It goes blank and OS X does not recognize that a second display is connected. ![]() When I hook up two displays to the Mini (one Thunderbolt, one HDMI) it will configure and work properly for a time.Īfter 1-2 hours, or if I do something graphically intensive (start a game) the HDMI display will drop out. I have a late 2012 Mac Mini running OS X Mavericks (10.9.5).
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