Display port to hdmi doesn't work

Hello people,

I hope you are well, 

I have bought this cable 

https://www.ebay.co.uk/itm/1-8M-QUALITY-DISPLAY-PORT-DP-TO-HDMI-MALE-LCD-PC-HD-TV-LAPTOP-AV-CABLE-ADAPTOR/253314267485?epid=4008795429&hash=item3afab4f95d:g:IJ0AAOSwq4VaM9cr

And I have connected it from my desktop(optiplex 7010) to my Samsung TV(UE55RU7400U )but it doesn't work, the tv shows no signal. 

Any ideas how to get this sorted?