DVI-D - HDMI switcher - DVI-D

Hey friends,
I've got a fairly convoluted and confusing HDMI situation. As DVI matrix switchers are so expensive, I decided to get a HDMI switcher and HDMI to DVI cables. I have two Mac Pro towers, each with two DVI outputs, and two 24" Cinema HD displays. So, my signal flow is:
Mac Pros - DVI to HDMI cables (x4) - HDMI matrix switcher - HDMI cable - HDMI to DVI adaptor - Cinema HD tail
The monitors simply flash three short lights, which Apple support tells me means that they are recieving an invalid format or resolution. I thought that HDMI and DVI were completely compatible formats... Any ideas as to why this is not working?
Thanks!

Going through a lot of "adapters" in that setup (cables "adapters", switcher, dvi adaptor).  I guess my first question would be to supply all the details of all those components to verify they are the proper components to handle the signals.  So, list url's to all the stuff:
1. dvi-to-hdmi cable
2. hdmi switcher
3. hdmi-to-dvi adaptor
4. hdmi cables (including lengths)
Maybe there's something in the specificaions of these things that would indicate the problem.
Update:
As an experiment you might want to try a single monitor and macpro without the switch.  mac pro --> dvi-to-hdmi cable --> hdmi-to-dvi adaptor --> monitor.  If it works then obviously the switch would be the culprit.

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    Message was edited by: ratrodrick

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