If they are legacy devices (cards which requires drivers) check bios options for legacy devices and install software which came with cards.
I have checked the bios to make sure the pci slots were on. tested cards on two other systems, both picked up the cards immediately after boot. Also I can not get the on board audio to work and its also turned on in the bios and I installed the drivers. I even updated the bios and still no dice. I did note that I have PCI 2.3 slots on MB and my pci sound card is 5 yrs. old can that be an issue?