Cannot enter the Bios anymore after new GPU

JayHD1080p

Commendable
Aug 13, 2016
4
0
1,520
Hello guys!

I updated my GPU from 970 to gtx 1080.
But now the Monitor says no signal detected. If i go back to my old GPU there is the same problem but sometimes i am able to enter the bios setup and sometimes i can see the windows boot screen but then it gets stuck. The most of the time i get no signal from both cards. every thing was fine before installing the new card.

What i have tried:
-Other monitors oder ports like dvi, hdmi
-pull out bios battery
-put in the old gpu

Before i installed the new card i uninstalled my old drivers in the driver manager but i cannot even enter the bios with both cards even if my operating system is missing