That happens under some conditions. some cards do not work in certain DA/QS machines apparently. I had a QS2002 that would not boot with the same card that worked in my DA. I *think* I had another Sil3512 that the QS did boot with or something(I might not be remembering correctly) but the card seemed to not be flashable even using a DOS based flasher.

Basically, if you have an incompatibility you would know before you flash the card because this thing happens regardless of firmware. As for the root cause I do not actually know if it is Apple or Silicon Image that is the true offender.(but I want to blame Apple, because Apple.) And I do not know of another fix other than either finding a different card or a different computer.