Why does my Intel® Desktop Board D845EBG2 system fail to boot?
The Intel® Desktop Board D845EBG2 has specific requirements for the power sequencing and limits. A momentary switch should be used for the power on/off switch. The power supply chosen must have the additional 4-pin +12 volt connector and meet the ATX12V specification*. If the power supply 2-by-2 connector is not plugged into the board connector located near the processor socket, the system will not boot.