Mr.peanutbutter said:
Every time the cable from the power supply got inserted into the graphics card, the pc didn’t turn on.

There was a fourth possibility.
The power supply was too weak to handle the graphics card.
It has been fixed.
The link has been added.
Did you PERCHANCE check the connectivity? Take a multimeter and see if the slots match each other. Mind you, you need to have the PC and GPU active.

Other than that, get a new power supply. GPUs aren't cost-effective when it comes to power usage, they are power hungry. I had to throw out a 300W PSU and buy a 500/600W Corsair PSU specifically for my nVidia GPU.