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I have a notebook with a strange behaviour under Win 7 x64 Home Fr.
External screen is working but not the main screen.
When I press Fn + F6, I see a very short time the main screen powering on and then get off.
Video adapter is ATI Mobility Radeon H4200 Series. (driver is 8.970.100.1100 - 24/04/2013)
I've installed AMD auto detect to update to this driver.
When I press Fn + F5, I see on the external screen which mode it will use (clone, duplicate...). But still can't get main screen 'on'. The auto detect define main screen has unknown.
Any idea ?