I have a BNIB HP Pavilion p6710 Desktop that has been sitting for 5+yrs in a cool dry place and I want to make it work as well as possible for my new-to-PC-gaming son. My hope is to upgrade the CPU, GPU and power supply to a point that he/we can play the new HD games. Specifically, the new Plants vs Zombies Garden Warfare 2 PC edition (and a couple flight sims of mine). We have a PS3, but having so many titles, a PS4 is not in the cards. Our existing desktop has an AMD Athlon II X4 640 / 3.0 GHz / 95w / Quad core processor w/ AM3 Socket. My mobo is an N-Alvorix RS880 uATX w/ an AMD 785G Chipset and 1333/1066/800MHz Front-side bus peed. I was told a GPU will have sound upgrade covered through HDMI connection. I'm using an ASUS VS278Q-P LED Monitor w/ 2 HDMI inputs / 1ms response / 80.000.000:1 contrast ratio / 1920x1080 max res. Desktop already has integrated Video/Audio, but I can upgrade using these expansion slot options. 1 PCI Express x16 slot for graphics card 3 PCI Express x1 slots 1 PCI Express x1 minicard slot I'll be upgrading the ATX power supply to 500w, 600w or 650w as necessary. Additional fan(s) too, if need be. I am willing to spend $200-300. So!?! Does anyone have a good idea of what I SHOULD DO to make this Desktop worthy for gaming w/o the need to buy a whole new machine? ANY and ALL assistance/advice will be SO VERY APPRECIATED and in advance, I want to say THANK YOU to ALL/the one(s) that can spare the time to help me out. My son AND I are very grateful!!! PS Are there any obvious problems associated w/ leaving a BNIB unit sitting for so long? Thanx again!