MacBook Pro 4,1 Ram Upgrade

I'm attempting to upgrade my ram from 2GB to 4GB on an early 2008, 2.5GHz, 6MB L2, MBP. I've purchased 2x2GB, PC-5300, DDR2-667MHz modules and attempted to install them. After installing the two modules my MBP would not boot. I contacted the manufacturer of the ram and they suggested attempting to install one 2 GB module and one of the original 1GB modules. This configuration functions properly. Both 2GB modules have been verified as functional when used with one of the original 1GB modules and have been tried in both slots. Any ideas as to why my MBP will not boot with more than 3GB of memory ?

Hi again,
Response from Centon suggests this: "MacBook Pro EFI Firmware Update 1.6 "
http://support.apple.com/downloads/MacBookPro_EFI_Firmware_Update_16.
I don't think it applies.
Model Name: MacBook Pro
Model Identifier: MacBookPro4,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.5 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 6 MB
Memory: 3 GB
Bus Speed: 800 MHz
Boot ROM Version: MBP41.00C1.B00
SMC Version: 1.28f1
Still at a loss as to why both modules won't work together. Centon advises that system should boot with only one module installed, I'll give it a try.
Many thanks

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