Has anyone here ever replaced the cpu chip? I was replacing the cpu cooling heatsink/fan and accidentally popped the chip out of the socket and after getting it back in and running again, it makes me realize how easy it would be to upgrade it. It's an intel p4 2.0 ghz socket 478, I was thinking of stepping up to 3.0 ghz. Is it just plug and play or would I have to upgrade the bios as well? What steps would I need to take before/ after doing this?