I recommend a new power supply first. Your hp case should work with any standard atx power supply. If that doesn't get you going, check ebay for newer hp boards. I have used the "boston" 7525 hp board made by msi with the g31 chipset. If you need 4 memory slots, the 965 or g33 chipset boards will work. Find a picture of the replacement board to see if you need a different backplate, which rarely comes with the board. You can order one from hp using their online tech support "live chat" if needed.