Upgraded RAM but now won't recognize

I just bought a 1GB kit from RAMJET (2x 512mb) and installed the new DIMM's inside my mac. Now when I plugged everything back in and rebooted, the computer is not recognizing the new memory. When I go to "About This Mac" the system profile says there is nothing in the two slots where I put the new RAM. Before upgrading I had 1GB of factory installed RAM (2x512mb).
My system says I have 8 slots (J11 through J44) and that I have "DDR SDRAM with a speed of PC3200U-30330." I purchased 1gig DDR400 128bit. These are the same right?
I read the instruction manual and did everything by the book before opening the case. Is there something extra I should be doing to make this work?

I adding 3 gig of RAM on my SP 1.8. I had all sorts of issues after the first 6 months. Apple blamed the RAM upgrade. I had the vendor replace it and now 2 of new simms are fine, but 2 simms will not be recognized no matter where I put them. All 4 of th enew simms are the exact same thing. Any suggestions or tests I can do before I call the vendor again?

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