Dual monitors definitely will not work with the vesa driver. And the HD5xxx card will not work with radeonhd. You will have to get radeon working, and it will have to be a very recent version to support your GPU (probably 6.13.0 or higher). And, finally, you should one use one screen section and one device section.
Switch to the radeon driver, try to start X, and show us the /var/log/Xorg.0.log file that is generated.
Adam
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