Mac os 10.12 not playing nice with Dell monitor. Problem 1: After updating to Mac OS 10.12.(1) after my Dell 2713HM goes into sleep with display port the monitor will not wake with keyboard or mouse input. The only solution is to reboot my Mac Mini. We have two identical mac minis and monitors now with this issue. Problem 2: When display mirroring is on the monitor goes off while the TV (through HDMI) stay on. Yes we have reset the pram.