IMac doesn't startup when new RAM is inserted

Hi all,
I'm trying to put in more RAM into my 17" iMac w/ OSX 10.4.10. I currently have 512 MB Ram, but want to install 2GB. I have tried several times to get the computer to start but no luck. I have replaced the original 512MB and am posting here with this configuration-so I know that the computer is recognizing it.
I have 2 new Kingston 1GB PC2-5300 667MHz DDR2 notebook modules. I tried just one with the original 512MB configuration and it didn't start up. Anyone have any helpful ideas as to whats going on and how can I get the computer up and running with the new RAM??
Thanks,
Vincenso

Sounds like your new RAM chips are not inserted far enough.
I had a similar problem when I installed RAM in a MacBook. You just have to push those chips in a little harder so they are seated correctly.

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IMac doesn't startup when new RAM is inserted

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