Tell me about the voltage you set on your ram in the BIOS. Now tell me what the specification is for your RAM.
At first I find most home builders can't believe that level of detail is needed or a new board will have an out of date BIOS but give it time. The home builders are learning fast.
I recently built a new rig with the following specs:
Microsoft Windows Vista 32-Bit Home Premium
BIOSTAR MCP6P-M2 AM2 NVIDIA GeForce 6150 / nForce 430 Micro ATX AMD Motherboard
LG 20X DVD