I installed a new motherboard, and it does not seem to be getting power. The green light is off. When I first installed the motherboard, it was connected to the old power supply. When I would plug it in, I got a clicking noise, but nothing else. I figured since it was only a 250w psu, and motherboard manual states 400w+, I put in a 500w power supply. Now I get nothing. Not even clicking noises. The whole thing wont even run POST. Literally, nothing happens when I plug it in, or click the power button. Yes I tried the switch on the back of the power supply. It's active PFC. I just installed a P5G41-M LX2 motherboard I installed a 500w OCZ stealthxstream2 power supply I already connected the 24 pin and the 4 pin power cables. Can anyone please give me some advice? (to at least get the green light on)? I would try a new processor or new ram, if this showed any signs of power going to the motherboard at all.