You should have a "manual" ram setting somewhere in the bios. Press the "del" key just before you get to the post screen and check your bios sections. Be careful what you change, or the board may not post when you save the new settings and exit. Pc3200 will register as 400 speed in your bios and with cpuz, a small bios file that gives your cpu, ram, and motherboard info.
After downloading and running CPUID I noticed that even though the stick in slot 2 is a 512mb, it only shows being 256mb. My overall ram does show 3gb. Does that mean there may be something wrong with the stick, or the slot? Your thoughts are appriciated.