MacBook Pro, NVidia 9400M, Windows 7 64-bit.
When I connect external monitor and I would like to duplicate display or extend it, I always get this error, despite monitor is correctly recognized. When trying to do the same but via NVidia Control Panel, my new settings are silently rejected (i.e. when I press apply, settings are reverted back to defaults).
I found several solutions, like:
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deleting HKEY_CURRENT_USER\Software\Microsoft\MobilePC\TMM registry entry — I don't have such one though,
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updating graphics card driver — driver is up to date,
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using graphics card control panel, instead of windows — as I wrote above, changes are silently rejected.
Is there any other way to use external monitor using Windows 7?
Best Answer
Does it work if you disable the internal monitor and enable the external monitor? This is the normal behavior if you try to activate concurrent displays that can't be active - most laptops will give this behavior if you try to activate two external displays while leaving the internal enabled (since most laptops only support two video outputs). It's possible that this laptop only supports one simultaneous video output but I don't know enough about Macs to say that - it seems odd, but it would fit the behavior you're seeing. It's also possible this is a result of the driver you're using.