I am having the same problem. However, your problem is obviously with your hard drive; chuck it and get a new one. My problem: I got a great deal on a "bare-bones" kit from TigerDirect, including the Intel D945PLnm mobo and an Extreme ATX mid-tower case with a 450-watt power supply. I have installed the board and all the components; followed the instructions to the letter, checked the power switch with an ohm meter, checked the RAM, but try as I might, nothing happens when I press the power button. I know it's getting some power, because my optical mouse lights up when I click the switch on my AC strip. I suspect the power supply, but don't have the equipment to test it; will probably take it to a computer shop for testing; that's the only thing I can think of at this point.