Went to restart computer to copy files to new computer and now it won't start. The green light on the back is on, and a green light on motherboard is on. When I push the start button, the green power supply light on the back goes off and nothing happens. I've checked connections, replaced CMOS battery, confirmed there's power, and also disconnected everything else from the computer. Any ideas? Just want to get some things transferred before it dies, which it may have done. It is an HP Pavillion P6000 series.