Check the BIOS. One way to tell is if all of your devices are listed when you first boot, then at least youre letting the BIOS know that they're there, but you still need to enable DMA in the BIOS for it to work properly. I had DMA problems in w2k until I realized that despite the fact that my drives worked, they werent being detected as DMA operable devices in the BIOS, so I had to set it to look on the second channel and enable DMA where applicable.