Installing new memory in MacBook Pro

I just installed a 2GB of memory in the slot where the 1GB was because it was not being recognized in the second slot.
When I first installed the 2GB in the top slot, which was the available slot, I turned the computer on and it didn't recognize the memory. I opened the back up again, and figured out that the memory was not pushed in all of the way, so I made sure that it was pushed in and when I turned the system on the little light was blinking, then I checked it again, and then the computer sounded that it was coming on but never came on, but the light was solid.
In order to make sure that there was nothing wrong with the memory, so I put it in the slot that the 1GB previously occupied, then put the 1GB in the available slot, which was the slot that was open from the beginning. At that point the system didn't boot up. But upon removing the 1GB from the slot and the 2GB being in the slot that the 1GB originally occupied, the system booted up fine.
The problem appears to be the slot.
Please advise.
thanks
Bobbbi

I've encountered the same exact problem when trying to install an Axiom Memory Solutions 2GB PC2-5300 667MHz DDR2 SDRAM SODIMM [http://www.axiommemory.com/config/products/branded/MA347G/A-AX.aspx] for my 2.16GHz Intel Core Duo MacBook Pro. It is currently up and functioning with the 2GB memory stick in the inmost slot alone but does not allow for both 1GB and 2GB memory sticks to be installed at once in either order of configuration. I have yet to test to see if it will function with the 2GB memory stick in the outermost slot alone, in which case if it were to function in this configuration I would conclude the problem to be caused by the combination of the 1GB and 2GB memory sticks.
Every bit of information I had read prior to making the decision to purchase this 2GB memory stick assured me that my version of the MacBook Pro would function under a 2GB/1GB configuration, but my findings here prove otherwise.
In order to determine what step needs to be taken in order to obtain 3GB of overall RAM, I need the following to be ansered:
Does my version of the MacBook Pro in fact allow for a 2GB/1GB memory stick configuration? If this is the case, which 2GB memory stick must I obtain [in order to assure I'm purchasing the correct memory stick - this time - I require the utmost specificity]. If this is NOT the case, I must therefore purchase another 2GB memory stick to accompany the one I just purchased in order to obtain the maximum 3GB RAM for my version of the MacBook Pro [that only allows for 3GB maximum even if 4GB of RAM are intalled]. I would naturally purchase the exact same 2GB Axiom memory stick I previously purchased, but I need to know if this configuration will in fact allow my MacBook Pro to function.
I apologize for my lack of brevity, but I would prefer to be specific and not have to deal with this problem too much longer.
Thanks,
Christopher

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Message was edited by: pcboy57
Message was edited by: pcboy57

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