Blank screen on Dell 5K


i've looked online fixes including things disabled sleep on display, disable monitor sleep in os x , seems have fixed issue until upgraded 10.11.3 , display doesn't work in os x anymore.

in fact can't work mac pro or 15" macbook pro, whereas no problem before (after doing stuff above). now, when boot computer, , blank, can't see login screen or anything. if boot windows [10], work perfectly.

ideas?
 

either post details or can't expect answers.

gpu, how connected, mode dell in, did broke it..., etc.
 


Forums Macs Desktops Mac Pro


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