RAM Upgrade, now won't boot

Hi all,
I recently bought 2 x 2GB Kingston RAM modules to upgrade my MBP from it's current 2GB (2x1GB) up to 4GB. The Kingston part number is KVR667D2S5/2G
When I swap over the modules, the laptop won't boot at all, just a black screen and the white LED just stays on.
I've tried each module individually and in each slot but no joy.
Please can anyone help me? Am I missing something basic??
My MBP is a 2.5Ghz 15" model, MB134LL/A, which according to the specs can have "Up to 4GB of 667MHz DDR2 SDRAM".
Thanks in advance,
Anthony

It's got me puzzled, and a bit annoyed really, as it should work up to 4GB. I've also seen reports from other people who have these same modules working in various MBP's.
It does/will work at 4GB with the proper RAM. I'm not surprised that some of the Kingston's VR works for some MBPs, but not yours. Here's why: Apple's specs are very tight (tolerances, if you will), compared to the PC industry, and seem to get tighter with each new OS upgrade. When you buy guaranteed Mac compatible RAM, it means that RAM has been tested with and passed Apple's specs. Just by chance, some other generic RAM (KVR, for instance), may pass and be compatible with Macs, while others won't. You obviously got some the is not compatible, and even if it was now, it might fail Apple's future specs. That's why I'd never buy KVR or generic RAM. I don't need the hassle that you're going through now, or, if not now, probably would go through in the future.

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