I hope you're still replying to posts. I've attached only the PSU (brand new), memory stick (was in the computer when the problem started), and graphics card (also in the computer when the problems started) to my Asus M2N-SLI Deluxe, but it still only powers on for about 3-4 seconds. I tried using the eraser on the memory and the graphics card. Additionally, I've reset the BIOS (by way of your explanation in previous posts). Furthermore, I plugged the keyboard in to see if the caps lock, num lock, etc would light up when I powered on. The CPU fan functions. There are no beeps at power on. I tried the processor test, but the computer wasn't staying powered on long enough for it to warm up. I kept powering back on as soon as it powered down. I did this about 3-4 times and I was able to feel the processor warming up. Based on previous posts, I believe the motherboard to be the problem. Before I go and buy new one, I just want to make sure you're coming to the same conclusion.