Yeah, try swapping it to another Zorro slot too and see if it works. I used to have a rev 4.3 mobo that was flaky as hell. Wouldn't use an accelerator to save it's life and only certain cards would work in certain slots. I ended up stripping my derringer from my old a500, and throwing it in my 2000, 'cos it was the only way I could get it accelerated.