@ Michael_
If you were getting a totally black screen, I would guess that the output was going elsewhere. But since you're getting some garbage, it's hard to figure, because the 9500 usually works with AROS. And you've tried the different grub options.
If you make your grub selection then hold down the space key, an early startup screen should display after several seconds. But if you still get a black screen, Who can say if it's the video or something else? Do you have another video card you can try?
It might be possible to get it running with an old version of Icaros (before 2.0) but that would not be totally compatible with today's software.
Btw, The Icaros Desktop pdf is a good read for new (and old) AROS users.