Imac not reading ram...

hi guys-
i recently bought ram from the apple store and installed it in my computer. I installed (2) 1 gig cards, the max my computer allows. My 'about my computer' still says that I only have 512 mb have ram.
any suggestions?

Take the entire iMac (no keyboard or mouse) to the Apple Store and have them solve the problem.

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    FUJI
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