FIC AM35 appears to be the stock motherboard costing if you can find it, around $150. Best bet would probably be to buy a modern board (Asus makes one that drops in). You will be able to use your processor, ram and just about everything else that you would like to keep. Your stock board comes with a power supply that was made just for HP. So, it would probably be in your best interst to buy another power supply. Even buying the board and power supply, you will save a lot over what the stock board cost if you could find it. Hope this helps.
3 different OS, so yep I\'m confused.