@hang-the-9 seems like thats not the problem
althought i just noticed something stranged happend.
when i plugged the displays in for the first time, every single of them showed color.
after a restart, my second monitor didn't show any color.
left for a minute, came back with my second monitor with color, but my tv without any color.
and i checked the cables of any were loose or something, but they aren't