I have an early 2015 MB Pro that developed a black screen (Out of warranty) but everything else works as I can use HDMI into a tv or another monitor. Sometimes it flickers on for a second or two whilst being used. Have tried all the button pressing as detailed by lots of users. Trackpad and keyboard also stopped working but managed to fix that problem by changing the connectors. Have to say it has been a nightmare since just after the warranty expired which is a shame as I like the OS. Don't fancy having to purchase a new screen. Thanks.