MacBook Pro Freezes, Shuts Down, Three Beeps

Hello, i have been having continuing issues with my MacBook Pro Freezing and not starting up. Sometimes after a slight move or bump it will freeze and not recover, sometimes with three beeps, sometimes not, and sometimes it just immediatly shuts off. It will also do this when it is not bumped, but not as often. I know that the three beeps indicates a memory error, but i have gone through and reseated the RAM and done 10 instances of Memtest while in the command prompt of single-user mode, and it has not indicated any failures. I have also booted into the diagnostics mode on the MacBook and tested the memory and the logig board twice. Still no failures seen. Finally i have verifyed the disk with Disk Utility and found no faults (However one time of my many tries it said that there was a fatal error that must be reparied from the Recovery HD so i booted into recovery and hit repair disk and it said there was nothing wrong, and all of my further attempts have been from the Recovery Partition).
I am just not convinced that my ram or my logic board is at fault here, and i am definatly not ready to put out the money for them if it will not solve my problem.
All help is appricieated. Thank You!

No this is the stock 4GB that shipped with the computer. And the only problem with that technique is that this problem will disappear for almost two weeks and suddenly every time I try to start it it will beep or freeze or if I bump it it will shut off or freeze. And after it acts up for a day or two I could do whatever I want to it and it will show no symptoms.

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