I have a Dell Dimension 4400, will ony boot to the window where it shows normal start or last good config . From there after you hit enter, tries to start, but goes into the blue screen. 0X0000007B error code. I have tried remove all the components except the CPU. Still blue screen. Different RAM, HD, pulled out all pci cards and ROM drives. Only thing that is hooked up is the HD. Blue screen. I am thinking MB?