Blackmagic Intensity PRO - HDMI Out-Put Issue


I’ve just purchased an Intensty Pro card (Blackmagic Design) for my “BoinxTV MacPro” (2.8 quad-core, 16gb ddr 3, 2x 1GB GDDR5) the HDMI input is working fine but the output isn’t detected by the pc… BUT if I start Blackmagic Media Express (the capture/player software supplied by Blackmagic) I can see clips (that i play in BM media express) also in a monitor linked to the HDMI output of the Intensity PRO card - the pc still don’t detect it…

Anyone had the same issue? Any solutions?