So, I used to have a pentium 4 2.8 GHz, but I upgraded to an Intel 2.2 GHz Core 2 Duo, both Slot 478. After I did that, my computer no longer works, it exactly being that it the monitor on and runs, but the screen is black and I don't receive any imgae or even a connection on the screen anymore, it's just running but doing anything, no monitor connection anymore. I grounded myself the whole time to prevent static, but what could be wrong? I also tried outting the old CPU in, still won't work.