I had this old e-machines t6003 that would no longer boot and I figured it would be a cool little project to give it modern guts. The goal was to have an office/light gaming PC that could run GTA5 without breaking the bank...The Ryzen 3 2200G seemed like the best fit for that, with integrated cooler and graphics. And indeed it does run GTA5 very well at 1360x768 resolution. Since I am not running a graphics card, my original 300W PSU was plenty enough to power the whole thing.
I picked a B450 board to make sure there would be no need to update bios, and I picked MSI because the original board was form MSI. Other criteria were M2 and 4 ram slots. I put a 500gb M2 SSD for storage, and opted against internal HD for silence. But I will add an external HD docking system to use my old hard drives when needed. This things boots Windows10 in less that 5 seconds...
I also ordered a pci-e internal IDE/Sata card to connect the original cd/dvd optical drive and the external hard drives.
Only issue I had was no POST at initial boot, and It was because apparently one of my ram stick is a 2400 and the other is 2666, while I ordered two 2666. This was fixed by setting the bios to 2400. But I will be returning this ram and replacing it with 2x8gb ddr4 3200 sticks which should be give the graphics card plenty of room to play.
Otherwise this was a pretty simple process for my first build, and I am more than happy with the outcome.