RAM issues - 1.25 GB registering when 2GB installed

Hi, I'm trying to upgrade the RAM on my Macbook but have encountered a strange issue. I installed 2 x 1GB 667MHz DDR2 SDRAM, but only 1.25 GB is being recognised when I click on 'About this mac'. This is divided between 256MB in Bank 0 and 1 GB in Bank 1.
This RAM was previously used in a Toshiba laptop which recognised both modules as 1GB so I don't think it's a question of mislabelling. Why is it only showing up as .25GB now?
Any advice or suggestions you could give would be really appreciated,
Thanks so much,
Aisling

Have you tried swapping the RAM in the slots to see if you get different results?
~Lyssa

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