I had a PicassoIV fail constantly on an A4000D eventhough it worked in an A4000T. The compter would simply hang and not even show boot menu. Other Zorro boards (think I had an A4091 and a Cybervision64 at the time) worked fine. After trying out many possibilities (initially I didn't even test on the 4000T and thought the board was dead) I ended up buying another very cheap daughter board from eBay, just to try out but didn't even bother to try it. Bout 2 years later I tried it and the PicassoIV worked!
No apparent explanation, maybe a bad contact somewhere, like happens with the CPU slot and it's very hard to detect if you don't remember it... Maybe a dead chip, daughterboard only has one.
José
