I was looking into converting a business PC no longer used for business into a pc built for gaming and general use. It is an HP Compaq 8200 Elite Convertible Minitower, Specs are as follows: Intel core i5-2400 (3.10 Ghz), Onboard Graphics (meaning no gfx card), 4GB DDR3 Ram, The motherboard's model could not be found, and I figure Its to be one of the first things I upgrade since it doesnt even support HDMI, and a 320 Watt HP power supply. I wanted to upgrade this over time, adding parts as I go. My question is, in what order should I upgrade the parts so that they are all compatible along the way?