I’m rebuilding a small form factor PC.. The old power supply which is fried was 220 watts and fairly small.. It powered a P4 proccessor, DVD writer, HDD, and ATI Radeon 9600 XT video card.. I know nothing about power and electricity and which power supply is okay for what.. I heard a PicoPSU may do the trick? or could I just buy any 220 – 250 watt power supply?