Q: 3-mintor setting won't work
I use 2 Dell 27" monitors via Display Port and 1 LED TV via HDMI port on an late 2013 Mac Pro. It was OK for 3 monitors working as a big long desktop before, but since don't-know-when the setting won't work. I can now either have 2 Display Port monitors working or one of them plus LED TV working. I don't know what's wrong with my setting. I'm sure all monitors and TV are working. please help.
OS X Mavericks (10.9.3)
Posted on Jun 8, 2015 12:13 PM
Make sure each monitor is on a separate TB. There are three TB buses, For which port is which bus see:
Mac Pro (Late 2013): Using multiple displays - Apple Support
Reset the SMC and NVRAM/PRAM
Intel-based Macs: Resetting the System Management Controller (SMC)
Posted on Jun 8, 2015 12:52 PM