Had Gigabyte GA SISXP1394 Mobo that died. Have full tower aluminum case and 2 pci HD's with XP Pro, Office, etc. Afraid of my 420W PSU as I'm not sure of what caused the burn out. I'll immediately need a good inexpensive 600W PSU and an HDMI Motherboard with on board graphics that I can upgrade later. I also need an inexpensive CPU which I'll replace later with a Quad core. Finally I need a 2GB Ram stick of either DDR2 or DDR3 depending on the Mobo selected. I need advice on an upgradable HDMI Mobo that can temporarily run an inexpensive CPU and later run a good Quad. I'd like the ability to run a minimum of 8GB of Ram and onboard 10/100/1000 Lan. I'm attempting to stay around $250.00 initially and I know that's hard to do which is why I'm reaching out to you for advice.