Man i will try to help you
First, unplug everything from your system (HDD, ODD, FDD, aditional fans, lights)
now with only the motherboard plugged, turn the system on and see what happens.
if work then probably a PSU problem (you will need to make some more test)
turn off and remove ram sticks, turn on again
if the computer beeps, then probably RAM problem
possibly CPU problem