You need to post the make and model of your monitor, and the make and monitor of your graphics card. (you ned to re-install the drivers)
If you don't know these details run this:
It will give you the information needed to provide help.
Nokia 8 vs Galaxy S8
Best new design books 2017: From vintage infographics to the the psychology of type
iMac 21.5-inch (2017) review
Nokia 8 : design, caractéristiques techniques, date de sortie