Is the video cable in the video card or the motherboard video?
the cable in motherboard but when im switching it my PC wont run
Well that is why it's saying HD 4600, that is what you have the monitor connected to. You may want to start at the beginning here with your issue, you did not say your computer will not run on the nVidia card. What exactly does that mean? Did this work before? Need full details what is happening and what you tried already. Your video card could be dead, maybe power supply issue, or PCIe slot, or motherboard issue. Really depends on what is happening and what you tested already.