It was so much frustrating,I was watching a video where a guy first put motheboard in case and then apply cpu and because of that a part where fans have to connect could not connect(gap between case and mobo put those connector screws backward) with CPU's fans screw ,i kept pushing and because of that centre alignment was kept getting changed ....but in the end with the help of seller I am able to put it,the only worry is that paste thing is not went well as it should be in the first attempt to put them together.