New answers tagged hdmi
I had the same problem. Eventually worked out that it only did this with HDMI cables (Tried 3 different ones) that had 'shielding' (High density triple shielding for maximum noise rejection). Tried a few cables with no shielding and it worked every time... The shielded cables worked fine with other laptops in our office though.
Put the brightness of your computer as low as possible (mine would completely dim so i can't see it) most likely using less battery power or even less than it would while the display is fully brightened. Make sure your settings are set to mirror on the display only.
Max supposed supported resolution on that card for an external monitor is 2560x1600, I'm afraid. The 2013 can do 4k, but not the 2012.
Only 2013 Macs (and upwards) are compatible with 4K. Current retina MacBook Pro (13" and 15") are compatible with 4K but only at 24Hz
We are using an inexpensive Mini DisplayPort to DisplayPort cable between newer (2013) MacBook Pros and the Dell U2713HM monitor, and getting the full 2560 x 1440 at 60 Hz. Our older MBPs need the more expensive Mini DisplayPort to Dual-Link DVI Adapter from Apple.
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