Hello all. I'll start out by stating that I'm not too smart when it comes to PC's but I'm pretty mechanically inclined. Anyway I'm looking to upgrade my regular old Dell desktop into something more. I'm mainly looking to do some gaming and what not but don't really know what to start with. I've got a Dell Dimension B110 with 512mb RAM, 80GB harddrive and Intel Celeron D 2.53GHz. Basically a stock low end Dell. Originally I was going to build this from the ground up but figured I could use this Dell as a starting point. So far I've taken all the Dell's internals and swapped them into this case.
Newegg.com - XION II XON-101 Black Steel ATX Mid Tower Computer Case 450W Power Supply - Computer Cases
This helps out with space because the Dell case is pretty small and it also helps keep it all cooled down with the 2x 120mm fans and single 80mm fan. I ditched the 450w included PSU with a more reliable Rosewill 500w PSU.
Newegg.com - Rosewill Stallion Series RD500-2DB 500W ATX12V Power Supply - Power Supplies
This has dual fans as opposed to the stock single. Plus it's a good boost over the stock 250w PSU.
Now this is where I need the help. The mobo can't take a graphics card. If I was to get a new mobo and maybe a proccessor too. Then get a graphics card will all the other stock parts be able to work with it? Any suggestions? Will the memory, CD-Rom, Harddrive, etc. be able to just plug and play so to speak? I was originally looking at some AMD Dual core PSU's because there farly cheap. I'm only looking to play games like BF2,COD4, etc. As well as be able to upgrade even further down the road for future games. Any help is appreciated, thanks.