Dell Dimension 9100 Will not accept my RAM Upgrade

I have a dimension 9100 and I am trying to put 2x2GB of RAM, I bought this off Ebay and the seller is assuring me that it is compatable except when I put in the memory sticks and turn on the computer it gives me beep codes and lights 1 and 3 light up on the front. What do I do to get this memory to work?
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More about dell dimension 9100 accept upgrade
  1. What type and speed of memory is it?
  2. It is 2GB Kingston 667mhz
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