[E442] Win7 - Blinking screen with Fn+F6

Hi,

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 ?

Thanks,

Vincent