I also had the same issue. I have two FirePro v3700 (R620) cards install. If both cards initialized it hard-locked as soon as X tried to start. It left an empty /var/log/Xorg.0.log file.
I also had the same issue. I have two FirePro v3700 (R620) cards install. If both cards initialized it hard-locked as soon as X tried to start. It left an empty /var/log/Xorg.0.log file.