My PC suddenly stops displaying an image

What could this be? Sometimes I’m playing or just watching a video on YouTube, then out of nowhere the video stops showing. Black screen, the YouTube audio and the PC’s RGB LEDs keep working though.

They told me to clean the RAM sticks. But how do you do that? With an eraser?

Couldn’t it just be a bad cable or one with poor contact?

Could it be that my graphics card is dead too? Please help, it’s urgent.

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I would test the power supply. I don’t think it’s able to handle it.

or the video card