Ram issues stopping MBP from booting up

I recently bought a MBP with 2GB of RAM. I installed another 1GB and at first everything was fine. However, after a week or so i found that when i boot it up the light stays on but the screen is black and the machine won't start up.
After reading various posts about swapping the boards around etc... i tried this and hey presto, it worked. Literally another week later and the problem started again.
Basically I've tried every permutation; the 2GB on it's own, the 1 GB on it's own, each in different slots, opposite slots etc..etc.. and have concluded that both boards work fine independently in the bottom slot but neither will work in the top. The minute i put any thing in the top slot it won't boot.
I work with Logic using a lots of virtual instruments. I NEED 3GB of RAM MINIMUM! Is this something i can fix or is it a 'back to the factory' job????

If the original 2 x 1GB RAM works then your problem is the 2GB SODIMM you bought. Otherwise, your slots have been damaged through your upgrade 9though not necessarily your fault) so in this case you need to call AppleCare.

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