Help me, my desktop screen going black

Sorry if i post this in wrong forum. But i need help. I’m so confusing. While i do my homework for next test, my computer suddenly shutdown. When i restart it. my sceen is black. Anyhelp. thank you.

Did you know that you posted for computer diagnostic help in the knitting help forum?
First, is it Windows, Mac, or Linux?
Second, is it laptop or desktop?
(Now it becomes specific to your above answers)
Third, did you check your power cords and video cables are all tightly plugged in?
You might try Google from your phone.

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Off Jumps Jack has some good starting points to start trouble shooting your problem but also consider that you may have a failure of the video card also known as a graphics card.