1) Are you using a PXI system which has an embedded controller with Real Time (RT)?
2) Did controller have RT installed / shipped with it. We can confirm that in the bios if the LabVIEW RT menu options show up?
3) Listed below are few links you can go through to get started and troubleshoot. Specifically the chapter 2 in the manual for 8184
4) When you connect a monitor to the controller what do you see in the screen?
5) Did you get a chance to install the embedded sw CD that came with the controller in your host computer?
6) You can also verify if you have a folder similar to following in your host computer after the installation (Similar to the following)
C:\Program Files\National Instruments\RT Images\Base\2.0\7151
Thanks and hope this helps to get you rolling