Are you installing the RAM in the right order? Your MB supports having one RAM stick, two RAM sticks, or 4 RAM sticks. However, when installing one or two RAM sticks you can't just put them in the first two slots.
If only using one RAM stick it needs to be in slot A2 (probably the second slot from the CPU, but not sure). If only using two sticks they need to be in A2 and B2 (probably the second and fourth slot). Look at the silkscreen on the MB to verify the memory slot labels.
Try using two matching sticks from a kit (you can tell if they're matching by the serial number) in slots A2 and B2. Remember, even if the MB QVL doesn't have your version listed that just means that they weren't tested. It doesn't automatically mean that they're incompatible.