pioneer navigation problem

I have just installed the  Pioneer sys610T.  The problem is I get power to the head unit (it ejects CD, powers up), but I can't get a video signal from it.  I don't know if it works. 

The touch screen monitor works fine a plugged it into a dvd player and it works fine.

Does anyone know what's going on?

Ok here's the story:

Called Pioneer today and described what's going on.  They stated that it sounds like a wiring problem and I should take it to a installation center to make sure it is wired correctly.  How else can you wire it?  I asked them, if I apply power to the constant and acc wire while grounding the black wire I should get something but I don't...NOTHING.

What will the installation center do that I haven't?

I've checked for 12+ on constant, 12+ when the acc in turned,it grounded, illumination wire is getting 4.5 volts, reverse is 12+ in reverse, park brake switch is grounded, vss not connected.

What more can be checked?