My best gues is that your delfina card is broken. I have had 2 differnt cards in two different revisions of amiga 1200 mobos both fine . Problems i used to have was choppy sound but turned out to be a -5 or -12 volt issue not the card it self. I have read about people in the amiga comunity that inserted the clockport cable the wrong way around something that fried the delfina card.
I realy hope i am wrong but the odds are there.
