Upgrading MBP to 4GB RAM not working

I have a MacBook Pro "Core 2 Duo" 2.5 17" (08) (EMC 2199) which accordingly can be upgrade to 4GB RAM. The memory type required for the model is PC2-5300 DDR2. So I went and bought two 2GB PC2-6400 DDR2 modules. When I installed both 2GB for a total of 4GB, the MBP won't boot or make a sound. If I install one of the original 1GB + new 2GB for a total of 3GB, the MBP boots. I have swapped the modules around from slot to another slot. I have tested both 2GB modules with one of the original 1GB module and it will boot. But when I put in both 2GB PC-6400 DDR2, the computer will not boot. Anyone have a suggestion on what I should do? Thank you.

BlackFrog wrote:
I have a MacBook Pro "Core 2 Duo" 2.5 17" (08) (EMC 2199) which accordingly can be upgrade to 4GB RAM.
Incorrect. If you do indeed have the Macbook Pro Core 2 Duo 17" from early 2008, the maximum RAM it can hold is 3GB. Read the second table on http://support.apple.com/kb/ht1270#link5 (the table titled "+Refer to this table for the maximum+...").
Message was edited by: Ben Alt.

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