External 1440x900 monitor doesn't work in Mavericks

I have a 19" LG monitor with native resolution 1440x900. When I connect it to my MBP Retina using a VGA->mini display port adapter it goes to 1280x960 resolution. When I Alt-Click the "scale" options, 1440x900 isn't even shown and "best for monitor" goes to 800x600!
The same monitor works perfectly when connected to a Windows 7 laptop, and another (1920x1080) monitor works fine (and shows 1440x900 in the list of possible resolutions). I've tried two different VGA->mDP adapters, and two different VGA cables with exactly the same result. Short of buying another monitor is there any solution to this? Is the monitor faulty?
Thanks

Hello meadowend,
After reviewing your post, I have located an article that can help in this situation. It contains a number of troubleshooting steps and helpful advice concerning display issues:
Apple computers: Troubleshooting issues with video on internal or external displays
Thank you for contributing to Apple Support Communities.
Cheers,
BobbyD

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External 1440x900 monitor doesn't work in Mavericks

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