It always helps if you give us as much info as you can, parts along with the model numbers can speed things up. This includes bios version.
Motherboard Asus A8N5X Phoenix Technologies, LTD ASUS A8N5X ACPI BIOS Revision 0502. i have already handled it buy putting Dlink Ethernet card
on the 1st mainboard AN17. I used US Robotics Ethernet card. and Cheap Sound blaster card.
Bios Phoenix tech- LTD 6.00 PG april 23 2002 this computer 7 years old. be nice if had remedy sorry about lack of data