According to the following link, any of this memory should work for you:
It seems you have problems when installing DIMMs into all four slots.
Did you try removing your old 1GB DIMMs to replace with either brand of the new ones? Does the system function with only 2GB of the new modules installed? If the answer is yes, you could try two 2GB modules in two slots (like KVR533D2N4/2G).