I am in the process of replacing a friends 420 e-machine's motherboard with a P4i65G Asrock mobo. I have also had to replace the psu. When I turn on the PSU the MB starts working (without being switched on!) and there is no display. I have put a small speaker in to hear any post beeps but get nothing. I have checked that the ram and psu are working and they are. So whats up? Anyone come across this problem before? Please help.