Hi, I just finished building my new pc this afternoon. After putting it all together I go to start it and...nothing. All the right LEDs on the motherboard are lit, but it just won't start. Whenever I press the power button the onboard LEDs flicker off for like half a second and the CPU fan twitches, but that's all. I've tried starting with only the CPU, RAM, and VGA card attached nothing. I've tried with alterbate RAM and VGA abd still nothing. I'm using an AMD Athlon X2 3800+ Abit KN9-SLI nVidia 7600GT 160GB Seagate HDD connected via IDE 1GB DDR2 single stick. I know this motherboard is specialised for dual channel RAM and SLI, but having only 1 RAM stick and one VGA card would not prevent the computer from starting. I've checked and rechecked all the connections, but they're all fine. I can only suspect that it must be the PSU or CPU, but I'm hoping it's something I can simply fix myself, I have no wish to drive all the way back to the store for a third time (second one was after realising the old PSU didn't have 4-pin power plug for CPU). If anyone has any idea a quick response would be most appreciated. Cheers.