What should I do if a black bar appears on the screen?

Question

macbook

Good afternoon!
What should I do if I have a black bar on the half of the screen for a fraction of a second when I move the cursor on my macbook in the calendar. Moreover, it appears only in the calendar, which is expanded to full screen.
Should I be worried at all? The laptop is still old, I bought it used and there is a crack on the hinge, which was sealed in the service center.

Answer 1

If it appears only in the calendar and you don’t see it anywhere else, then I would attribute this to a software glitch. And so, in fact, one can only guess if there is a problem with the cable - then in theory it should react and show artifacts when the top cover of the laptop moves ...