Hello Barb_Gr, thanks for joining the Intel communities.
It looks like the monitors use "Generic PnP Monitor", so once you installed our Intel Graphics drivers it is trying to communicate with the EDID of the monitors and that could be the cause of this behavior.
Could you please Access the Intel HD graphics control panel and let me know which is the refresh rate you are using?
Could you please attach the DX Ddiag report from your system so I can check the current information?
Dxdiag Report: Type dxdiag in Start Menu> open> Save> Attach using Advanced Editor Options.