This is a Desktop. No idea what his PSU is, so I can't really help with that...
HP Pavilion Slimline s5730f
http://www.newegg.com/Product/Product.aspx?Item=N82E16883147697
HP Pavilion Slimline s5730f
http://www.newegg.com/Product/Product.aspx?Item=N82E16883147697