internal MBP display black if non macOS boot
Hello
I'm using a Macbook Pro Retina late 2013 with macOS Sierra 10.12.6.
Installed was also with the Bootcamp Assistent Windows 10 1709. Some days ago when I started Windows just with the internal Macbook screen the screen stayed black. When I connected a external screen via HDMI then I could see everything under Windows normal. When I boot to macOS then I can see also everything on the internal screen doesn't matter if a external screen is connected or not.
After removed the BootCamp partition to install Windows again. After creating the Bootcamp partition and rebooting the macbook to the created Windows installation FlashDrive it's possible to see the Windows Logo but after the internal Screen get's black and it's also not possible to see something on the external screen in this situation. On an other Macbook it's possible to boot from the Flash Drive and it works fine so show the installation screens on the internal screen.
Any idea? Thanks in advance for your help.
MacBook Pro (Retina, 13-inch, Late 2013), macOS Sierra (10.12.6)