brendanqqw :
Which Connector should i buy to make my Graphics Card Running?
The Item did not have a free connector so im thinking to buy a new one..
Look at the specification of your actual GPU to see what connection it is. It will have at least one or a combination of VGA, HDMI, DVI. This also has to match whatever input you have for your monitor. If your GT 710 has a HDMI output, and your monitor has a HDMI input, then get a HDMI cable for example.
But once again, follow those previous steps first! Having no cable will not stop your PC from booting.
Is your PC NOT BOOTING at all? Or is it starting (all fans and lights start) - but your monitor has no signal?
Also what PSU do you have?
I will iterate once again, not having a VGA/HDMI cable WILL still let your PC boot, you just won't get any signal on your monitor. So if your PC is outright not booting at all, then the cable is not your problem.