I have a QDI board that I'm running with a 2.4GHz P4...It's dual DDR 400, but I'm running 512MB of DDR 266. I'm trying to install W2K and during the beginning where it starts the setup utility after it loads some items from the CD kills all power to the system and turns off! The BIOS recognizes all devices. Does anyone know if the Dual DDR 400 boards are backwards compatible w/ 266 and if that would even be a problem? I'm stumped...and don't know what to do short of taking the board back. I've tried it with 3 hard drives and my main drive is a brand new Maxtor 120GB. Any help is appreciated...