You can use one DVI-D cable through the HDMI output of the graphics card with a cheap adapter. For your U2711 that can do DisplayPort, you really need to get a DisplayPort cable because DVI-D to DisplayPort adapters are not good.
Return that DVI-D to DisplayPort adapter thingy. Those kinds of adapters are not good because DVI-D and DisplayPort are internally very different. The adapters then have to do complicated work, they need actual electronics inside them, and things go wrong.
DVI-D and HDMI are related to each other. They use the same signal. This means a DVI-D from/to HDMI adapter is a simple and cheap device because it's just wiring the two plugs together. Those kinds of devices are good and usually work.