Need a list of your parts so we can make sure nothing is not compatible. Also before you mounted the motherboard to the case did you make sure you installed the correct amount of standoffs so that motherboard would not ground out against the case? All power cables connected? You shouold have the 24pin and the 8 pin cpu connecters attached. Do you have a system speaker attached to the motherboard pins to hear any bios beeps which would tell you why its not booting? Or does the motherboard have an LED display with a code listed?