HelIo, dear friends! I'm from Belarus! My english is very bad. I have a problem! I have two system on my hdd(windows 10 and Mac os sierra 10.12.6 ). After exit from windows 10, i run Mac os, and Monitor goes to sleep at the end of the boot sequence. But, if install video driver again and reboot computer, mac os running without this problem. But if run mac os next time, Monitor goes to sleep at the end of the boot sequence again. I need every time install video driver, to solve this problem. If does not run windows after installing mac os, mac os is running without this problem. But as soon as run windows, problem is appearing again.
Video example - https://youtu.be/SGiqXnzVvNA