Second monitor loses signal

Hello,

i got myself a new main monitor for my pc (i was already using 2 screen).

in the beginning the new screen and my second screen both worked, but after restarting my pc the second screen did nog get any signal anymore.

when i go to my monitor setting it show both screens but also says show only on screen 1.

as soon as i put it on expand and save it it turn on the second screen and after a few second it goes black and says it has no signal and the setting i change reverd automatic to only show on screen 1.

i tried the same in my nvidia control panel but exactly the some thing happens.

the old way my screen where plugged into my graphics card was:

HDMI cable from card to monitor 1 and DVI cable from card to monitor 2 (24"+19")

with the new screen i used my older biggest screen as second monitor (so 29"+24")
and both connect with a HDMI cable.

the second thing i tried is connecting my old 19" again with the DVI cable to see if that helped but without succes. the same thing happens when i try to expand my screen (or duplicate).

anybody that could help me figure this out?

if it helps my graphics card is a GTX1060