DVI to HDMI doesn't work with Panasonic Monitor

Hi all,
I have a Panasonic monitor, model TH-50PX75U that we've used with my Macbook Pro.  I have an DVI (large style) to HDMI cable that we connect the Macbook with, and it works fine.
I also have a MacPro that I want to use this monitor with. It has 1 full size DVI display port and 2 mini display ports.  In the past I've used the DVI and one mini port to connect 2 monitors at once one the MacPro and it has worked fine.
I tried  connecting the Panasonic monitor to use on my mid 2012 MacPro  but I never get a picture.  I reconnected one of the other monitors to a mini dispplay port and can see that the MacPro recognizes the Panasonic monitor.  Both monitors show up in the Display section under System Preferences.  I've tries various settings for the Panasionic monitor but I can never get anything to display on it.
What am I missing here?  The MacPro is a mid 2012 with 3.2Gig Quad Core / 6 Gig ram / Radion 5770 graphic card, and runs ML 10.8.3.
Any advise is appreciated.
Thanks!
Ray

Ok, so I had time to do some testing and here's what I've done:
I plugged in my Macbook which does work on the Pana monitor, and looked at the Profile.  I then compared it to the Profile on the Mac Pro.  There are some differences which I'm guessing have to do with different HW.  I'm going to include some photos of the working and not working monitor scenarios do you can see what I'm seeing. 
Does anyone have any suggestions as to how to make this work?
Photo1: Shows the Macbook and the Pana monitor together using DVI to HDMI cable to connect the two.
Photo2: Shows the display settings with the small monitor and Pana connected to Mac Pro.  Notice there are no numbers in the diplays. Mirroring them doesn't work either.  The small monitor is using a DVI to mini port adapter to connect to the graphics card, the Pana is using an HDMI to DVI cable (same one I used with the Macbook) to connect to the DVI port of the graphics card.
Photo3: Both monitors are on.  The Mac Pro knows the Panasonic is there but I never get a display on it.
Message was edited by: Rayzorx

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