I need a replacement motherboard for the Ms6577 ver-4 1

If this is your board: http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&dlc=en&docname=bph07843&lc=en#N708, then get what you can on ebay or craigslist. I usually replace the board and cpu at the same time, but since your ddr may also be bad (unless you have another board to test it on) you may want to replace all three. Here's some options:

http://www.ebay.com/ctg/MSI-Xenon-Socket-478-Motherboard-/98294008
http://www.ebay.com/ctg/Intel-D865PERL-Socket-478-Motherboard-/74079126
http://www.ebay.com/itm/CPU-Motherboard-RAM-Combo-Supermicro-P4SC8-Intel-P4-3-0GHz-/170931154740?pt=US_Motherboard_CPU_Combos&hash=item27cc4a6f34

I recommend something like this if you can order from them:

http://www.geeks.com/details.asp?invtid=BOXDQ35JOE-BO-R&cat=MBB
http://www.geeks.com/details.asp?invtid=E6400-R&cat=CPU
http://www.geeks.com/details.asp?invtid=D34017-001-BULK&cat=FAN
http://www.geeks.com/details.asp?invtid=1024DDR25300-HYN-R&cat=RAM (order two at $10 each)

Total for the geeks upgrade about $85