Being careful installed ifixit memory max we Ram Upgrade kit 2GB

I have a black screen after start up with the I fix it 2GB kit installed. I was very careful about static made sure to ground myself. When I put re install the 1 GB RAM originally installed (also an IFIXIT) (the data on the sticklers says exactly the same thing- 1GB DDR2 PC2-5300 667MHz except the PIN numbers. The original I took out says 204PIN and the ones I was sent say 200PIN.) Was I sent the wrong RAM? The chips look identical. Are they just miss marked? Is the one that works missed marked? What can I do?