I just got through building a computer for a friend. This makes the 4th computer ive built myself. I install everything properly. Everything is plugged in, and installed correctly. I finally plug it up to the wall, and hit the power button. Everything powers on. Hd is on, all fans(including cpu fan which is powered through the mobo), mootherboard lights come on, cdrom, ect. But nothing boots up. No beeping sounds from built in speaker, nothing comes up on the monitor, and no hard drive activity. Any idea on what could be the problem? Im leaning towards a defective motherboard or processor. I just wanted a second opinion before I start shipping things off for replacement. Thanks.