1 of 2 27" cine disp Working

Mac Pro 2,1 w/ ati 5870 and 10.7.5

I have two 27" cinema displays, but only one will work at a time.

Any idea beyond all the usual stuff?

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What does or does it not do? What have you checked? what do you consider the usual stuff?

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Help us help you. The more complete the description of your problem is (some history of what's happening when it started happening, why you think it may be happening, what OS you're using -there's a lot of those, a full compete description, the text or screen shot of any error messages) the more assistance we can provide, and, the sooner we can provide it..

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