[color=000cff]2.[/color][color=ff000c] Did you plug in the 4/8-pin CPU power connector located near the CPU socket?[/color] If the motherboard has 8 pins and your PSU only has 4 pins, you can use the 4-pin connector. The 4-pin connector USUALLY goes on the 4 pins located closest to the CPU. If the motherboard has an 8-pin connector with a cover over 4 pins, you can remove the cover and use an 8-pin plug if your power supply has one. [color=ff000c]This power connector provides power to the CPU. Your system has no chance of posting without this connector plugged in![/color] Check your motherboard owners manual for more information about the CPU power connector. [color=ff000c]This is easily the most common new-builder mistake.[/color]