HDMI wont display on Monitor

Hi I bought a new computer,Dell XPS 8700 and a new monitor, HP Pavilion 23xi.
well basically I'm trying to connect my HDMI cable to my monitor, but when I turn on the computer it displays the following message on a black screen with white writing:

System halted!
Attention: Unsupported Video Configuration Detected
Action is Required
This computer has an add-in graphics card, but the monitor is plugged
into the integrated video connector.
To attach the monitor cable to the add-in graphics card:
1. Shut down the computer
2. Plug the monitor cable into the add-in graphics card connector.
This may require a video adapter or video adapter cable.
(provided with the system)
3. Turn on the computer.
This message should not appear after completing these steps.
For more information or help, please refer to the system documentation
 
 
I have no Idea what to do at this point, the monitor recognizes that HDMI is active so I think it has got something to do with the DELL XPS.

Here is some more info on the computer:

Processor - 4th Generation Intel® Core™ i7-4770 Processor (8M Cache, up to 3.9 GHz)
Operating System - Windows 8 64 bit
Monitor - HP Pavilion 23xi IPS LED Backlit Monitor
Memory - 16GB Dual Channel DDR3 1600MHz - 4 DIMMs
Hard Drive - 2TB 7200 RPM SATA Hard Drive + Intel SRT 32GB SSD Cache
Video Card - NVIDIA® Geforce® GTX 660 1.5G GDDR5
External Chassis Connections
Rear: HDMI, Display Port, RJ-45 (10/100/1000Base)