Hi Lin, Thank you for your answer. What I don't understand is the following. I just looked at an Acer 6463 it has an resolution of 1280 x 800. If I connect a monitor i can chooce 1400 x 1050 so I think the laptop support the resolution. But I can only chooce for clone the display and the display of the laptop cant'handle 1400 by 1050. The other choice is use the second monitor as an extended screen. The videocard is an ATI Radeon X1300. Regards, Jan