My LiPo battery charger needs a 12V supply. I have had a few ATX power supplies laying around and wanted to use the 12V output for the charger.To get the PSU to work you need to connect the PWR_ON pin to ground and add a load onto the 5V line.I have attached the circuit diagram to this post - although YM seems to have cut most of the information off - please read my blog post about it: http://infinitetadpole.wordpress.com/2014/03/21/battery-charging-mains-supply-with-atx-psu/