I am having a problem with two new Socket 478 motherboards. One is an Aopen and one is an ASUS. Both are brand new. I am replacing a defective motherboard in an E-machines computer. I have installed a new power supply and have tried both motherboards. Neither board with detect any devices connected to the secondary IDE interface. I have replaced hundreds of systemboards and have never had this problem. I have checked to make sure that the BIOS has this device enabled. One board is an Aopen MX46-800N and the other is an ASUS P4S8X-MX-UAYZ. I feel that I must be missing something obvious. I may try another power supply or is it possible for a CPU to be defective and cause this? I can't imagine that two new Motherboards would have defective secondary IDE connections.