I was looking for a addon for blackland and i found something.
it was a .EXE, i know i cant trust that but i downloaded it
after that i had a virus called Wooden Sail and i could remove it
the deinstallation said that i had to reboot my pc
i was dumb enough to do that!
I rebooted my pc and my second monitor (BenQ T91W) woulnd't turn on.
i looked it up in my pc settings and it woulnd't find it
after that i tried my HDMI cable and it was the same!