3 ways are there to fix it
1 .
First go to the steam
go to Library
go to properties
then go to launch option and put -autoconfig
then it will fix issue hope so also give the command -fullscreen -full
or
-windowed
2.
Second Method is to verify integrity of files for CSGO.
3.
last option is to update driver
if there are updated version available
in case u have recently update your driver
then just roll back
like uninstall the recently updated version
and then search for one or
two version lower driver for your card
Intro:(0:00)
First Method: (0:07)
Second Method(1:15)
Third Method(1:30)