vesa driver doesn't always work well with high res (@least from what i saw before), isn't there some real vid card driver for this?
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can you try to edit like above?
(killall gdm-binary will also be needed after killing x i think)
Thanks -- I edited my xorg.conf accordingly and rebooted but that didn't help.
Then I tried changing the driver from vesa to radeon (the iMac has a ATI Radeon HD 2600 PRO graphics processor). When I rebooted, X couldn't start, and I got sent back into system-config-display. I configured that for 1920 x 1200 as before but that only created the xorg.conf that I posted in my first message.
Thanks for your suggestions everyone. Are there any other suggestions?