Not sure if this is the issue, but your board calls for PC3200 or lower. Your RAM is supect.
Both BIOS and Windows only see 128MB of RAM. I have two OCZ PC 3500 512MB Performance Series, OCZ4331024PFDC-D. It does not matter if I use one stick or both, BIOS and Windows only see 128MG of RAM. Placing them into different slots did not make any difference. I have installed all the latest drivers and patches for the motherboard and Windows. I am sure that there is enough power for the motherboard. It is a 400W power supply and BIOS showed that there is enough power for the system.
AMD 64 3200+
Windows XP Home
OCZ PC 3500 512MB *2