Bought pc tried to input graphics card but doesn't show up at all HELP

Jul 3, 2018
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Bought a pc with biostar a960d+V2 mobo so everything else works fine but when I place my HD 7770 into it doesn't display I've tried disabling the integrated graphics but still nothing come on and I know it's not the card as I have tried it in another system
 


Not sure if this helps processor is fx8350 4gb ddr3 ram well 6gb but don't want to insert the other 2 yet
 
 


Ok but every time I connect to my graphics card monitor just say power saving mode so it picks it up as being connect but no display
 


Yeah it require 6 pin and it’s connect shows green led