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Try different cables/DVI adaptors first.
Swap the power bricks over maybe? They go bad quite a lot.
How old are the monitors?
bashthebox-
monitors are a couple of years old, though got them both second hand.
Irritating thing is that as mentioned both monitors work when plugged into the full size DVI connector, it's just the one that is plugged into the mini DVI adaptor that falls over.
But now it's come back it's a case of is the adaptor fucked, or the connector on the machine, and if it is why is the monitor now working? confused..
cornelius_blackfoot
quick query, I have a lovely two cinema monitor setup going with my mac pro.
Every so often one of the monitors goes black, it happened to me last night. One monitor goes in via a full size DVI connection, the other goes in via an adaptor to mini dvi.
Both monitors work through the dvi connector, when swapped over as I always think when it happens that the black one has gone up in smoke.
Resetting the PRAM does nothing, and it only came back when I took out the usb connectors for both monitors, restarted and then plugged them back in, both monitors came back.
If anyone has had something similar happen, or has an idea about why one monitor when working normally goes dark, it would be appreciated...