[ubuntu] problem with resolution

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http://ubuntuforums.org – hai guys i am using ubuntu 9.10 and i have a prblm with my resolution .i cant change my resolution highter than 800*600.i have a samsung 17" monitor and asus p5n73 motherboard with nvidia chipset .can anyone help me . iwaqnna use full graphic features of ubuntu. i am a beginner in ubuntu. please help me.......! (Hardware)