it'll take some time, but reseat everything... rebuld it. reseat the mobo, cpu, ram, etc... all of it. when you start to put it apart, remove the battery and clear the CMOS while you rebuild it. put in only one stick of ram, and one drvie each. (DVD/CD and hard drive) once you do that put the battery back. make sure you have all your connections correct then try it. Since you have not installed the OS yet, it's an issue of hardware conflicts.