can´t alter display resolution on new dapper install

[anthony baldwin]

My wife bought a new computer, with xpmedia edition, and asked me to 
install Linux for her to give it a try.
(She´s used windows forever, but has seen my use Linux since we married, 
and noted how
I don´t have any of the viruses, crashes, etc., and wants to give it a 
shot.)

I partitioned the drive and installed dapper (since that´s what I´m 
still using, being slow to
adopt upgrades until bugs are worked out), and everything went lovely, 
except,
the display is set at 640 x 480.
Her graphics card and monitor should allow at least 1024 x 768.
I can see these options in the xorg.conf,
but don´t seem to be able to modify the value in the systems preferences 
application,
even in administrator mode.

any assistance would be deeply appreciated.

tony

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