maybe you have flashed your blizzardppc with a flash that support grex? if yes then this might be the problem..
try to flash with latest firmware that supports ONLY bvision.
I had the same problems when I got grex and voodoo3 and after I couldn't make it work tried to go again with bvision..
flashing back to bvision only firmware solved my half problem (the other half, that was to have the voodoo3 working is until know not solved)
