Display issues with MacBook – should I replace it?

today when I tried to start my computer, the screen was just white for a while, and then a vertical pink bar appeared on the right side of the screen. I didn't know what to do so I pressed the "on" button on the top right of the keyboard, but when it restarted the same thing happened with the screen (white --> white with pink bar, and then a vertical purple bar appeared on the left). i closed the screen, and when i opened it, everything was normal and it prompted me to log in, and then everything worked.
Could this be foreshadowing a serious problem with my computer (i.e. will I lose all my files/do I need to buy a new one?)?
Thanks
also I didn't mention that recently my computer was stolen (I got it back), but it probably got pretty banged up in the process... could that have something to do with this?

Recent MacBook spare part searches: purple bar on macbook screen