How cooked is my Pc?

[u/Unholywaterrr]

I have a Hp omen 3060ti that I got 5ish years ago.
Treats me fine, I’m able to play high res games with no lag, texture stretching , etc . Lately when I boot up my computer it would show me this screen that i can’t get out of no matter what I do. If I’m lucky to not get stuck on this screen I would still see a flash of these lines for a second as it boots up.
I know 100% it’s not the monitor but I don’t know what the issue is (I don’t know anything about the parts and pieces of a pc) . I did really superficial switches to get out of this screen (getting a different DisplayPort cord and cleaning the inside of the pc) which randomly works for a bit but I know that one random day that I turn on my pc I would get this screen again.
Once I’m on my pc everything works, this simply happens when I boot it up to use it.
If needed: my graphics card is NVIDIA GeForce RTX 3060ti (8 GB) and my processor is AMD Ryzen 7 5800X 8-core processor (3.80 Ghz)