macbook screen problems

Hello

i have 13 Macbook Pro (md101) - there is no retina

when i was't connected to internet and tried to open page in Google Chrome i saw error chrome browser webpage with gray background - and on gray color my macbook's screen was blinking (flashing)

i thought it was chrome error, but after creating a screenshot with this page - i saw that it happens not only in chrome - also over screenshot openned to the full screen i see that my screen is blinking (flashing)

there is some post about it and also there is this screenshot - test it on your 13 macbook on the full screen viewing mode