Ram upgrade not recognized

i just bought two one gig sticks of ram from 18004memory.com and after removing the two 512 sticks i had and putting in the two one gig sticks, i wasnt really noticing much of a difference. when i click on the apple in the top left corner and select 'about this mac' it still lists ram as 1 GB 667 MHz DDR2 SDRAM. im like 90% sure i have installed these correctly and i mean, the computer works and all, but why wouldnt it recognize the upgrade? any ideas?
i called apple and they had me turn off the computer and hold appleoption+pr on start up which didnt help and to change something in the power (while it was off, hold down the power button for like five seconds) which didnt help either.
macbook, white. 2 GHz intel core duo. 1 gb 667 MHz DDR2 SDRAM
macbook   Mac OS X (10.4.8)  
macbook   Mac OS X (10.4.8)  

Likely, either one of the RAM sticks is bad or it is not seated correctly. You can try removing and replacing the sticks in turn to see which stick is bad and eliminate the possibility that a slot is damaged.

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