Upgrading RAM from 2GB to 4GB on newer iMac - No Dice..?

Hello, I have an aluminum 2.4 Core Duo iMac (7,1), with 2GBs of RAM and want to upgrade it to 4GBs. Bought (2) 2GB sticks from Apple and they popped in fine. Then, I got a black screen when I restarted, would not boot. So I swapped out one of the new 2GB sticks with one of the older 1GB sticks, worked perfect, 3GBs registered. Then I shut down and tried it with the other new 2GB stick, and that also worked fine, registering 3GBs of RAM.
I reset the PRAM under both configurations and the iMac still will not recognize the 4GBs of RAM, as it will not boot up.
Any suggestions?
Thanks,
Dan

Dan,
Very strange as the iMac 7,1 can actually support up to 6GB of RAM.
0. See my signature below.
1. Just search this discussion area for 6GB.
2. See also http://eshop.macsales.com/item/Other%20World%20Computing/5300DDR2S6GP/
You wrote that you have a Core Duo, but the 7,1 is a Core 2 Duo (big difference).
I suspect that one or both of the new SODIMMs is/are bad.
1. Check to make sure that each 2GB stick is the correct speed. The label will either say: 5300DDR or 667MHz. Any other speed will not work.
2. You bought the memory from Apple, so march into your nearest Apple Store and get them to make it work.
3. Return the SODIMMs to Apple and get your money back and buy 6GB from OWC (see link above) for $40 less than you paid for 4GB from Apple.
,dave

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Upgrading RAM from 2GB to 4GB on newer iMac - No Dice..?

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