Make sure the pink part of the cable (the key) is right next to the power supply. Those cables can fit in wrong and your devices will not be detected. You could also try and change your jumper setting to cable select and see if that works. Are your ide devices connected to an Ultra ATA device? If so physically uninstall that device and reboot your computer. Sometimes if you change your bios or reinstall windows and still have that device in there, windows will not detect your ide devices. As for the plug and play thing, I see i have mine disabled. Let me know if any of this helps you.