Flickering/Blinking with your elementary OS, and If you have an Intel chipset you can try this, your problem will be solved.
Get information about your graphics card
Open the Applications launcher and open System Settings, When the window appears, scroll down until you see the About icon under the System category. Click it and some information about your operating system and a computer will appear. Under hardware, there is a line starting with Graphics. Next to it is the information about your graphics card.
Using terminal to get information on Graphic card, Just type this command in terminal
lspci | grep VGA
More detail Information
sudo lshw -C video
If you have an Intel chipset you can try this, your problem will be solved.
sudo apt-get install mesa-utils sudo mkdir /etc/X11/xorg.conf.d/ echo -e 'Section "Device"\n Identifier "Intel Graphics"\n Driver "Intel"\n Option "AccelMethod" "sna"\n Option "TearFree" "true"\nEndSection' | sudo tee /etc/X11/xorg.conf.d/20-intel.conf sudo reboot