Problem installing 512mb RAM in Macbook Pro.

Hi,
I hope someone can help me, I have checked other posts and nobody seems to have the exact problem that I have after installing RAM.
I installed a Crucial 512mb module in my Macbook Pro which already had a factory installed 512mb module in one slot.
First time the Mac started up ok but it did not recognise that extra RAM had been installed. I reseated the crucial module and the Mac would not start, just a pulsing power light and a black screen.
I installed one module at a time and the Mac booted correctly with both the Crucial Ram abd the RAM it shipped with.
When I put in both Modules it will not boot, I switched the slots and made sure that modules were inserted correctly but no joy.
Sorry for being so long winded!
Macbook Pro   Mac OS X (10.4.6)  

Thanks guys,
It just seems odd that both modules are working correctly when they are installed on their own and there is no boot when they are installed together.
As you stated it may be that the specs are different but I checked and all the info seems the same.
I'll just go ahead and send it back to Crucial for a replacement.
Thanks again.

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