If the above does not work. You could try removing all component except cpu, 1 ram, mobo, psu, cpu cooler, vga (intergrated is recommended) and bring them all outsite pc case, putiing on any non-electric conductivity surface to test if the case shorted your mobo or thepsu did not provide enough power. If these not work, try testing on another psu. If it still not work. You could replace the motherboard. I believe it should work then.