I had a Gigabyte GA-945GM-S2 with 2 x 512 DDR2 667MHz. I bought another 2 x 512 DDR2 667MHz. Same type, size, speed and producer. With the 4 x 512 DDr2, computer shows only a total of 1gb RAM, instead of 2Gb. If i put 3 x 512, total is correctly, 1,5gb.
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Your MB is AM3 with 128MB DDR3-1333 built-in, four 1.8 Volt DDR2-1200+ depending on cpu. Have you enabled cpu 64 bit extensions? Tried slowing down your memory bus?
My ASUS use dual channel for dual core cpu. I have 2 yellow and 2 black dimm sockets. Both dimms in yellow is single channel, one in yellow and one in black is dual channel. Might try 2,1,2,1 rather than 2,2,1,1 order. If only your 2 1GB dimms are seen then why do you get 4 GB from 1GB+1GB? Sounds like sockets 1,2 are giving you 4GB and 3,4 don't work? Are the 1GB+1GB in 3,4 visible if the dimms in 1,2 are removed? Per Gigabyte page your AMD Phenom II 920 is AM2+ : "Note: Due to AMD AM2+ CPU limitation, memory module DDR2 1066 or above speed is only supported by 1 dimm per channel." Per AMD (which does not show your cpu, AM3 cpu fit AM3 or AM2+ socket and support ddr2 and ddr3, AM2+ cpu only work in AM2+ socket and support ddr2 only.
This is the website link for your board on gigabyte website. http://www.gigabyte.com.tw/Products/Motherboard/Products_Spec.aspx?ClassValue=Motherboard&ProductID=2159&ProductName=GA-8VM800PMD-775
Suggest you have a faulty piece of ram or a clock speed miss-match. your board supports up to 2gb of memory.Try also reseating the memory.
Let me know how you get on?