I would try updating the video card drivers to the latest just in case there is a weird conflict. You can always uninstall and downgrade to the ones on the disc later if you want. Since you seem to have problems with crossfire try installing the new drivers with just one card and then install the 2nd one. Also, make sure that you have the latest BIOS and chipset drivers for the motherboard, not the one from the CD.
In addition, that PSU has multiple rails so make sure that the cards are on separate 12v rails so that they don't cause instability.
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