[Andres Delgado] " I say that because i don't know much about the setups about the AJA."
Andres.
this usually means you do not have all of the cables connected correctly.
HDSDI and HDMI only carry the video signal- The Large black cable that connects the Box to the computer should have the AJA name in the up position when the cable is attached this is the larger cable that looks like it is a DVI cable (but is not)
gary adcock
Studio37
HD & Film Consultation
Post and Production Workflows for the Digitally Inclined
Chicago, IL
http://blogs.creativecow.net/24640