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How do I know what type of power supply to get for my HP pc?

I need to upgrade my power supply to about a 350 watt pwr supply in my HP in order in upgrade my video card. How do I know what type of power supply to get for my HP pc? Link to my HP below. http://search.hp.com/query.html?charset=iso-8859-1&hpvc=contextual&la=en&qp=url%3Awww.hp.com/hpinfo/newsroom/&qs=&lk=1&rf=0&uf=1&nh=10&st=1&hps=HP+Newsroom&hpn=Return+to+the+HP+Newsroom&hpr=http%3A//www.hp.com/hpinfo/newsroom/&hpa=http%3A//www.hp.com/country/us/en/contact.htm&hph=&hpl=1&hpo=&h_audience=&h_audiencerestrict=&qt=HP+Media+Center+m1160n+Desktop+PC&ocoldqt=hp+media+center+pc+m1160n&oc=434777

Public Comments

1. the sive of your tower, its mostlikly atx