Phone glitching and having black screen?

I couldn't find the device listed when I was choosing for my question. My partner has a Samsung Galaxy A12. From what she's described to me in her panic: She was watching youtube, and playing an app. Suddenly, the screen glitched and there were popping sounds coming from her headphones.

Further, she turned it off completely then back on. The screen began to "glitch" and the screen went dark. She has described that the screen goes black after glitching immediately after, so she is unable to do anything: Phone calls, see if it's charged, sound is working.

From what I gather, these "glitches" seem to affect the coloring of the pixels. She hasn't tried to factory reset because the phone seems to go glitch out and blacken before she can feasibly do something.

I have told her she needs to take it in for repair when she's off work, but in the mean time I'm wondering if anyone has knowledge that I could give her? Lastly, from what I've seen there is no visible damage.

Is this a hardware issue?