HT4279 Only two screens will work on my 5870 Radeon

I have a 6 core 3.33Ghz Mac pro running latest lion software. Just fitted a 5870 Radeon.
Only two of the three screens will work at any one time. A 24" Apple Cinema HD (Dvi) and two Dell 1708FP (these have an DVi to mini port adaptor each).
I have swopped them round to all possible configurations. Changed leads etc etc.
Can anyone help please

To get three screens to work with adapters, all adapters must be ACTIVE, POWERED adapters. Apple Dual-Link adapters for this job work fine, but are pricey. These are more that ATI has tested:
http://support.amd.com/us/eyefinity/Pages/eyefinity-dongles.aspx
Adapts:  Mini DisplayPort™   To:  DVI-D Single Link Active
AMD Status
Manufacturer
Part Number
Max. Resolution
Purchase
Gold
Accell
B087B-006B
1920x1200
Buy Now
Gold
Bizlink
KS30015-131
1920x1200
Coming Soon
Gold
Startech
MDP2DVIS
1920x1200
Buy Now
Gold
Wieson
G9858C219-006-H
1920x1200
Buy Now
Many are available on Amazon, but shop with great care, as Amazon's search is "fuzzy" and will include stuff that does not quite match (and will not quite work).
This one is US$32 with super-saver shipping:
http://www.amazon.com/Accell-B087B-006B-DisplayPort-Single-Link-Certified/dp/B00 4071ZXA

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