If the PCI Bridge chips on the Main, Host, and Controller cards are IBM 85352 chips, the card order must be changed. The d24 card(s) cannot be on the first bridge (slots 1-3) so move the d24 audio card(s) to the other side of the controller card in the chassis.SBS offered an upgrade to the IBM 85353 chips (on all 3 boards) but the IBM bridge chips are no longer available.