Hi everyone, this is my first post here so thought I'd say hello. That's not what I originally came here for, though. I got the task to build a computer for my sister (I had previously built my own comp several years ago) and began work today. I got the components installed on the motherboard, no problem, but after installing the power supply and trying for a test run, I ran into a problem. Hitting the start switch does not start up the computer. At first I thought it might be a problem with the power supply unit (NEXUS NX-4090 400W) but then I noticed that there was a green LED on the motherboard that was supposed to say the computer is in standby mode. If the LED is turned green, it must mean the mobo gets power from the power supply unit, but why is it then that hitting the start button does not do a thing? I have checked the cables many times, so I don't think there's a problem there. I don't remember having this kind of problem back at the time I built my on computer. Any help would be appreciated, it's frustrating to spend many hours working on that only to see it does not start up. Thanks in advance.