ATI 5870 can't play from minidisplay port

Hi
mac pro 12 core, ATI 5870, 12 core - 2,66 ghz, 8 gb ram, sata Tempo e2p card to 2 lacie disks. Bought on sept 2010.
In many occasions I cannot use mini displayport of the mac pro with my two hp 24" (they offer different output: displayport, dvi, hdmi). I cannot use hdmi port too with a minisplay port - hdmi converter (maybe this could be for the resolution?). If the Ati card cannot read the minidisplay adapter so it is impossible to use two monitor!
I had to write "in many occasions" because sometimes the connections works.
Until this morning this configuration worked: for the first monitor a dvi cable to dvi port of the 5870, and for the second monitor a displayport cable with a mini displayport adapter to one of the two minidisplay port on the 5870. This last monitor now remain black, letting the other one going well. If I turn off this monitor the other one become active in single monitor mode. Otherwise it behave like a second monitor.
Is this a 5870 problem? Or.... How can I solve it immediately??? Help please.
SOrry but for me it is difficult to explain this frustrating situation in english but I need a big help now.
Thank you and bye
Claudio

To drive 3 monitors you need 2 Dual Link DVI to MiniDisplay Adapters.

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