Is there a BTX Socket AM2+ Motherboard? If so, could you find me a BTX Socket AM2+ Motherboard.
BTX is a dead end. It was introduced by INTEL a few years ago. The only reason for buying a BTX motherboard is to keep a computer going if you do not have the money to buy a new case. If the chipset is not the same as the one you are replacing you will have to re-install the OS and if you do not have the CDs to do the re-install there is that additional cost. I would try ebay, there are two HP boards listed there. They both are HP Compaq dc5750 motherboard with no IDE ports and with four SATA ports.