GNONE

well in fact, there is no relation between gnome and the resolution of your screen.
In X-Windows systems, the windows manager (ie gnome or kde) is independant of the hardware configuration. to change your screen resolution you'll have to re-configure X-Windows by launching Xconfigurator (the easiest way), or XF86Setup (both in X) or xf86setup (in console mode).

Make sure you run Xconfigurator to select the settings for yr system.
If you have selected the resolutions in the Xconfigurator process, you can select the resoultions that you config thru gnome by pressing CTRL and '+" key to cycle thru the resolution that you have set during the configuration.

At your prompt type Xconfigurator the process will start the are just a few major parts of this process that is important 1)when Xconfigurator asks you for a clock chip setting choose the default which is the first of the list 2)next is to find the brand name of your monitor if you dont find the name of your monitor try the generic choice and try a 800X600 if it is a 15 inch monitor the resolution you might want to test it before your conclude configuration.

At your prompt type Xconfigurator the process will start there are just a few major parts of this process that is important 1)when Xconfigurator asks you for a clock chip setting choose the default which is the first of the list 2)next is to find the brand name of your monitor if you dont find the name of your monitor try the generic choice and try a 800X600 if it is a 15 inch monitor the resolution you might want to test it before your conclude configuration.

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