Problem with Macbook Pro 2,66Ghz and 4GB Kingston memory

Hi all,
I bought 2x 2GB Kingston memory(SODIMM - DDR2 @ 667MHz) in order to upgrade my MBP.
When I install both modules, the MBP won;t boot. I get a blank screen.
If I use 1 Kingston module at a time (1x1GB(original memory module)and 2GB(Kingston)) .It works fine.
Both of the Kinston RAM modules seem to be working fine, when not installed together, but MBP doesn;t start when both are installed at the same time.
Any idea of what the problem could be?
Is related to my MBP or it has to do with the Kingston Modules?
Thanks in advance.

D. P. Bailey wrote:
Hi, I'm having the same problem on the 2.4 (early 2008 2.4 GHz macbook pro.) I bought 2x 2gb Crucial RAM and installed correctly, but the machine doesn't start up. So, I tried every conceivable combination, but the new 2gb RAM only works when paired with one of the old 1gb sticks giving me 3 gb total.
The new 2gb sticks BOTH work (when paired with old RAM), just not together. The 2gb RAM they sold me shows its speed as 6400 800mHz -- Could the faster speed be the problem? My system profiler shows the 800mHz RAM as 667mHz when it is installed.
D.P. it looks like you have the same mbp as me. I talked to Apple Support on the phone a couple weeks ago doing my own research and learned (i'm not SUPER tech-savvy) that the laptop is 800mhz but will only accept ram of 667mhz because the computer has to be faster than the memory installed in it. They cannot be the same speeds. Don't know if this would cause the problem you are having, though.

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