for my computer when i built it, i put it all together and hit the power button. It turned on, but nothing came up on the monitor, nothing seemed to be booting up but the computer was running. Turned out after switching Vid cards/hard drives/ram , that my Motherboard was DoA. RMA'ed it and got a replacemtn, works now. just my 2 cents (not saying it's your mobo, just giving my situation hoping it helps)