Acer Travelmate 2420 and projector troubleshoot

Hello,

thanks for providing support.

I'm currently trying to connect my laptop acer travelmate 2420 on a projector toshiba tlp s10. Laptop shows perfectly on projector while logging but once logged on there's no input. I have tried Fn plus f1 to f12 keys trick but nothing happens. I also tried to click right desktop then settings but there's nowhere I can fix this.
 
I found a way to show the laptop on the projector by clicking right on desktop then graphic options then output to monitor. But now I'm facing the screen resolution problem.
 
by reducing the resolution to the minimum (800 x 600) I partially solved the problem. I'd say that its good enough to project.

Thanks for support
 
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