Apple 20" CD connects fine to MacBook Pro 2009 via DVI to Mini displayport (adapter) but not to Radeon 5770 (either MDP ports) on MacPro 2008?! Have Eizo CG223 on DVI to 5770. Any ideas?

Here's the setup:
Eizo Coloredge CG223 DVI to DVI on MacPro 5770 interface (ACD works fine on this too, naturally).
Apple Cinema Display 20" have the DVI connector. I have a Mini Displayport to DVI adapter on this, into one of the 5770's MDPs, neither of which seem to work.
Plug the same ACD via DVI (with DVI to MDP adpater) into my MacBook Pro 2009 MDP and it works fine as a second screen.
So what's up with the 5770 MDPs? I've seen online that the card should at least support two displays, either MDPs x2 or MDP and DVI. I've seen there may be an issue with three, not two.
Any ideas please?
Thanks,
Y

Striped down to bare inputs - monitors and keyboard/mouse. Works! Dimerising must have interfered with it. Phew!

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