Changing monitor resolution after installng

[pinecone <pinecone@kw.igs.net>]

Hi folks:

I installed sarge from CD and then upgraded by internet.  My monitor is 
capable of higher than 800 x 600 and I indicated so during the 
installation but the Gnome resolution selection shows only 800 x 600 or 
lower. I assume that I have to change a setting somewhere but don't know 
where or how. Please assist.

pinecone