K5200 not giving a display

I have a i9 10900, 64gb 3600mhz ddr4 ram and the K5200 from eBay, I wanted to test some games on it but it doesn’t switch on, the seller tested it before and it worked, the fan comes to life but once or twice the screen went blue with no text, I tried to install the drivers on integrated graphics but Nvidia didn’t allow me

Hi there @alexpizzichini, welcome to the NVIDIA developer forums.

Usually this forum is reserved for developer questions and your issue seems more consumer related.

The Quadro range of cards is not really designed for gaming, much rather for professional graphics applications. Nevertheless, if your system does not boot up with it installed, it can have lots of reasons, which you can find in more general Hardware forums than here.
Power connection ok? Power delivery ok? PCIe seating ok?

Finally, this is a ten years old GPU, this can also be a HW fault.

Good luck!