The graphics card is running but there's no display...

Thank you, Epango, for your responsiveness. First question: "We need to clarify this point. You mean you remove the GPU and connect the monitor to the motherboard, and then you get an image. When you put the GPU back in, do you connect the monitor to the motherboard or to the GPU?" : Yes, when I remove the graphics card, the PC runs normally, Windows starts... when I put the graphics card back in, the PC runs as well, the fans on the graphics card spin, but I have no image. Whether I connect the HDMI to the motherboard or the graphics card, it's the same!

And the second question: "You cannot install the drivers for a GPU without it being inserted into the motherboard. The monitor must necessarily be connected to the GPU and not to the motherboard at the time of driver installation. Otherwise, it fails."
How can I install drivers if when I put the graphics card in, the PC shows no image? PS: when I go into devices, I have an Intel graphics card recognized (logically the one from the processor), maybe it's because I have that one activated that it doesn't work...?

If you want to contact me more easily or ask me questions: Here is my Discord: WyLinK#8097

Thank you in advance for your time.

"How can I install drivers if when I put in the graphics card, the PC displays nothing?"

Indeed, that's impossible. You need to first find out the cause of why your GPU is not displaying anything. The PCI-Express 16X slot may have been damaged.

"PS: when I go into devices, I have an Intel graphics card recognized (logically the one from the CPU), maybe it's because I have that one enabled that it doesn't work... ?"

You can only access that when the GPU is removed, from what I understand. It's normal for the CPU's IGP to take over when you remove the GPU.

Finally, provide information about your PC (motherboard, CPU, RAM, power supply, etc.) or the brand and model of your PC if it's a branded one.

Thermal paste on what?