Might be a DVD read or BIOS problem. Some older PC BIOS/DVD combination do not support DVD boot and/or boot to DVD with >2GB image Try the boot DVD disc on another PC, preferrably a newer model. eg. my older A7N266VM desktop would not boot one DVD while my newer Dell 700M laptop boots the same DVD just fine. Turned out that if I used a different DVDR or DVDROM drive with the same DVD boot disc on the A7N266VM, it will boot properly.