Mac Air not detecting NEC Mutlisync LCD display

Mac Air is not detecting an additional display. Any ideas?

same problem w/macbook air 13" with snow leop. minidisplay to dvi acer 24" external... intermittent the external won't wake up. After much research I see others have the same problem and no answers except: 1. plug/unplug dvi, 2. reset to sleep and rewake up -
This maybe connected to the monitor not auto detecting which input is connected after wake. from what I see it's no better w/Lion or Mt Lion

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Hey
Thanks for the reply!
I have two USB HDD, with the copy from snow leopard dvd, and both are formatted in GUID, they work fine on my laptops and even the old mac mini, just not working on two identical Mac Pros.. Its very strange, as it keeps booting to leopard, and if I remove leopard Disk, and just put the new one and connect the USB dive, its shows a folder with a "?" mark sign!
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Reset PRAM. http://support.apple.com/kb/PH18761
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Choose the method for:
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Best.

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If your query is resolved then please click on “Accept as Solution”
Click on the LIKE on the bottom right if the post deserves credit

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Mac Air not detecting NEC Mutlisync LCD display

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