I no longer see anything on the screen of my laptop, what should I do?

I need help with my laptop so in advance he is always on my desk and nothing has leaked or he has not gotten any strong movement well so last night I did some schoolwork with him and it all worked just fine as me Today I wanted to see if I already got a grade, I turned on my laptop and suddenly I only saw a quarter of the screen, the rest of the screen was colored with colored and black spots or stripes, I don't know where and why it came from I hope someone can help me there (sry that it's all without a period and a comma😅)

Display or graphics card defective. Rather the latter.

Then sounds like a new purchase. Test by connecting an external monitor whether the display is working properly.