macbook pro 15 2018 - black screen

[jeyjey]

Hello to everyone ... i have a macbook pro 2018 15`. I have the last months the following issue. When the macbook is closed i cant open it ... the machine seems to get started , but the monitor is totally black. I can work with only sleep mode. After some updates installation i have the same problem ... i am trying a lot of times to get started moving the power cable of move the monitor up and down. i have the mojave os and i have the latest updates

 

[RigSatMe]

Have u tried to run hardware built-in apple test?

 

[jeyjey]

i dodnt know if i can ... When the macbook closes its very difficult to power on the monitor ....with some tricks and luck .With your method i see that i must close macbook first .