Black stripes on screen

[Emo]

I have a problem with my display on my computer screen. 4 black stripes have appeared at once on my screen, my screen is not a flat screen.

Could someone help me?
thank you in advance

[johnson22]

Are you sure you do not change the size horizontally and vertically to the display?

[Birdie]

I have not done absolutely nothing I was on msn at this time!

[Birdie]

the display is still the same except smaller and on display there's a black frame?

[Wingit]

Look on your screen, you should have some buttons, try expanding the size of the display horizontally and vertically, tell me if the black bars have disappeared afterwards.