After trying and trying, installing in every way, testing every howto, i finally got my 3D-ATI-proprietary-driver working… yippeaaaah 
The key is: Don’t use the 8.6-driver… my very last try was the driver version 8.4… i created package for suse 10.3 (i’m using 11, but it seems to make no problem), installed it via yast. Then into console, su, init3, aticonfig --initial, reboot into int3, sax2 -r -m 0=fglrx, YEAH - no blackscreen - the sax2-configpromt appeared!
As there are many threads with blackscreen on ati-driver and x1…-card, I think this might be the trick for some!?
Have luck 