Macbook Pro 17 inch RAM limitation?

Hi, I am using MBP 17inch 2.5GHz core 2 duo. I wanted to upgrade my ram from 2GB to 4GB, so i bought 2x2GB Kingston ram, DDR2 667Mhz. But when i installed both, my computer does not start up! but when i replaced one of the new 2gb ram with the older 1gb ram, making a total of 3gb, my mac could start again. So my question is there a limit to the ram capacity??
Hardware Overview:
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 (system): 1.28f2

I have exactly the same problem and i've heard that you need to upgrade the firmware version...
The problem is that i don't know how to do that so i can't tell you that it works.
Help's welcome

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EtreCheck version: 2.1.8 (121)
Report generated March 10, 2015 12:38:17 PM EDT
Download EtreCheck from http://etresoft.com/etrecheck
Click the [Click for support] links for help with non-Apple products.
Click the [Click for details] links for more information about that line.
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    MacBook Pro - model: MacBookPro9,2
    1 2.5 GHz Intel Core i5 CPU: 2-core
    4 GB RAM
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        BANK 1/DIMM0
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    Bluetooth: Good - Handoff/Airdrop2 supported
    Wireless: en1: 802.11 a/b/g/n
    Battery Health: Normal - Cycle count 343
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        Color LCD 1280 x 800
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        disk0s1 (disk0s1) <not mounted> : 210 MB
        Untitled (disk0s2) / : 499.25 GB (479.98 GB free)
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