I assume your pc won't boot up so you can't use any Utilities to identify the RAM & cpu from windows. If you put in the serial number it should give you more details.
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I assume you want to keep as much of the original hardware as possible. This is what my pc has, but yours could be different. Motherboard: GA-8I848PM CPU: socket 428 3.4GHZ P4. HT ( hyperthread) Hard disk: mine is SATA 1 RAM: mine has 2 slots of 184 pin DDR pc2700 but I have changed mine to pc3200 low density. AGP8 graphics 3 pci slots The dvd rom & writer are IDE so you will need at least one of these. The motherboard also has connecters for the card reader. You'll need to check out motherboards for the same specs that you have.
I'm afraid I can't be more help than that. Or, you could upgrade, & buy a new motherboard bundle with cpu & fan, you should be able to use the hard disk & dvd drives.