Hello and welcome to Techspot.
Please list the system specs (mobo, cpu, ram, hdd, power supply etc).
First things to check:
1. Did you connect 2 cables to your motherboard? Both the 20/24 pin and the ATX12v?
2. Is the ram/cpu compatible with your new board?
3. Did you use the standoff pins under your motherboard to separate it from your case?