hi, g-rex user here....
remove the g-rex, RE-FLASH with removed g-rex (and the LATEST flash on the unofficial g-rex support site) and power off. then re-install the g-rex and see if it works now.
also check if the voodoo works OK on a pc and be sure you have plugged power to the g-rex board!
the A1200 mobo revision and it's fixes are irrelevant IMHO, I have an unmodified 1.D4 mobo here working fine...
