First I set up my pc normally and then downloaded minecraft and steam and then suddenly it was black screen
And then he just kept walking and I switched it off and then switched it on again everything it does now is to beep 1 long and 2 short beeps all the time, see below and the ventilation goes on, yes and that's all. I just wanted to say one thing, I only got the pc today
https://de.wikipedia.org/...lt%C3%B6ne
graphics card failure
See if the GPU is properly plugged in and connected, if the picture suddenly disappears and then remains black, then there's likely a fault with the GPU.
One long and two short means there's a problem with the graphics card.
If you're lucky, it might just not fit properly or dirt might have gotten into the interface. Also check the power connection. Something like that can be fixed easily.
However, if you are unlucky, the graphics card is really defective.
The "beep combination" you mentioned indicates a defect / error in the graphics card. You can try carefully cleaning it if it is very dusty (with a dusting cloth, for example). If this is not the cause or does nothing, then the graphics card is probably defective and must be replaced.
How do I know if it is sitting correctly?
It is important that it is correctly locked in place, this can be checked by pressing it cleanly (not pressing through).
Switch off the PC, unplug the cables and remove the GraKa again. When you have it in your hand, put it back in and press it firmly in three places: front - middle - back
When you have done that you screw the GraKa tight and connect the GraKa to the power again.
It sits correctly but I don't know if all the cables are plugged in correctly. It looks kind of weird and I wanted to say one more thing and that is a finished pc because I only have it since today
Handy list, save it.