Okay well I'm about to buy the new motherboard and I have a couple to choose from. Here they are, tell me which one you think is the best and if it works with the specs I posted above. Biostar P4M80M4, Supermicro ,MSI , Another MSI board ,ASRock.
I bought a used Asrock mobo yesterday with an 8x AGP slot and socket 478 that works really well for $95. I got a 2.8 GHz P4 along with it. I am very happy with it. If you could find the same one I have somewhere for a good price it would suit you well. I'm not exactly sure of the model number of my mobo though.
i have a question for you that i havn't seen asked yet. Have you tried re-seating the RAM, or even different RAM sticks? I see this fix alot of no-post problems, and i'm curious to see if you've done this or not.