Mew White Macbook accepts 3GB Memory Upgrade but NOT 4GB Upgrade

[bruceaparry]

I have just taken delivery of a new white Macbook and I upgraded HD to WD Scorpio Blue 500 GB HD and memory to Corsair VSA4GSKIT667C4 Mac Memory 4GB 2 X 2GB PC2-5300 667MHz200 -Pin SODIMM for apple laptops.

It would not work even after correctly reinstalling the new memory a number of times

I decided to put back the original memory but by mistake I installed one old dimm and one new dimm and the computer then installed Mac OS X on the new HD and works OK.
Info shows 3GB of Memory = 1 x 2 GB and 1 x 1 GB.

Why will it not accept 4 GB?

 

[velocityg4]

I have just taken delivery of a new white Macbook and I upgraded HD to WD Scorpio Blue 500 GB HD and memory to Corsair VSA4GSKIT667C4 Mac Memory 4GB 2 X 2GB PC2-5300 667MHz200 -Pin SODIMM for apple laptops.

It would not work even after correctly reinstalling the new memory a number of times

I decided to put back the original memory but by mistake I installed one old dimm and one new dimm and the computer then installed Mac OS X on the new HD and works OK.
Info shows 3GB of Memory = 1 x 2 GB and 1 x 1 GB.

Why will it not accept 4 GB?

Did you try swapping the 2GB Dimm that is working in there with the other module you accidentally left out?
It could just be that the other module is defective.