T400, External monitor displayed off center.

So I have a Lenovo T400 with the ATI/onboard switchable graphics. When I plug it into my external monitor with the onboard graphics enabled, it displays correctly. When I have it connected with the ati graphics enabled, it displays off center and cuts off the right 1/5 of the screen. If I have my external display at a lower resolution, it works like it's supposed to.
1680x1050
1440x900
I've already tried reinstalling the drivers and adjusting the screen position with the monitor... any other ideas?
BTW this is on Windows 7. Laptop code is 2764-CTO

I hate to bump this, but I'd love some help.
Thanks

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xrandr --output LVDS1 --off
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Screen 0: minimum 320 x 200, current 2560 x 1024, maximum 32767 x 32767
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How do i fix my desktop it is displayed off center to the left of the screen

how do i fix my desktop it is displaying the taskbar and desktop screen display to the left of the screen??? i have tried updating, sytem restore, changing screen display resolution,

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T400, External monitor displayed off center.

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