screen resolution problem

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http://askubuntu.com – I've been playing with ubuntu for just a few days and so far i really like it. but i am having a few problems more specifically my screen resolution. I'm running 11.04 (natty) kernel linux 2.6.38-14-generic GNOME 2.32.1 on a Dell dimension 2400 with my on bord graphic card Intel Corporation 82845G/GL[Brookdale-G]/GE Chipset Integrated Graphics Device (rev 01). I try changing it using the xrandr command but all i get is xrandr: Failed to get size of gamma for output default my monitor is unknown and the resolution is 1280 X 1024 with a refresh rate of 0Hz rotation normal and while (HowTos)