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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..
Try different cables/DVI adaptors first.
Swap the power bricks over maybe? They go bad quite a lot.
How old are the monitors?