the ram led light and the video led light will not come or or any of the fans??? even if you hit ram ok button??
if it doing that check that the 24 pin and 4/8 pin power connectors are on and that the cpu fan and any other power connector is still connected fine. check the ram slots for bent pin. check that there nothing shorting the mb out. if they look fine i would see if you had another ps to see if you lost a power leg in your old ps.
I tried the RAM ok button with no luck, and the fans stay off also.
I also tried my old/working 500 watt power supply which again the power led on the motherboard lights up but the PC stays off.
I might have, however, bent pins on the memory slots. But than again I tried every slot on the motherboard with no luck.